diff --git a/src/wp-includes/class-wp-script-modules.php b/src/wp-includes/class-wp-script-modules.php
index dbfa038f8cbe2..e41d1004350c9 100644
--- a/src/wp-includes/class-wp-script-modules.php
+++ b/src/wp-includes/class-wp-script-modules.php
@@ -30,6 +30,18 @@ class WP_Script_Modules {
 	 */
 	private $enqueued_before_registered = array();
 
+	/**
+	 * Holds script module identifiers that have been marked for inclusion in the import map.
+	 *
+	 * A script module that appears here should be include in the import map regardless of
+	 * whether it is in the dependency graph of enqueued script modules.
+	 *
+	 * @since 6.8.0
+	 *
+	 * @var string[]
+	 */
+	private $marked_for_inclusion = array();
+
 	/**
 	 * Tracks whether the @wordpress/a11y script module is available.
 	 *
@@ -148,6 +160,21 @@ public function enqueue( string $id, string $src = '', array $deps = array(), $v
 		}
 	}
 
+	/**
+	 * Marks the script module for inclusion in the import map.
+	 *
+	 * This method is intended for use outside of the script module dependency system.
+	 * It's recommended that script modules rely on the script module dependency system
+	 * to manage the import map.
+	 *
+	 * @since 6.8.0
+	 *
+	 * @param string $id The identifier of the script module.
+	 */
+	public function include_in_import_map( string $id ) {
+		$this->marked_for_inclusion[] = $id;
+	}
+
 	/**
 	 * Unmarks the script module so it will no longer be enqueued in the page.
 	 *
@@ -208,10 +235,15 @@ public function add_hooks() {
 	 */
 	public function print_enqueued_script_modules() {
 		foreach ( $this->get_marked_for_enqueue() as $id => $script_module ) {
+			$src = $this->get_src( $id );
+			if ( null === $src ) {
+				continue;
+			}
+
 			wp_print_script_tag(
 				array(
 					'type' => 'module',
-					'src'  => $this->get_src( $id ),
+					'src'  => $src,
 					'id'   => $id . '-js-module',
 				)
 			);
@@ -228,11 +260,16 @@ public function print_enqueued_script_modules() {
 	 */
 	public function print_script_module_preloads() {
 		foreach ( $this->get_dependencies( array_keys( $this->get_marked_for_enqueue() ), array( 'static' ) ) as $id => $script_module ) {
+			$src = $this->get_src( $id );
+			if ( null === $src ) {
+				continue;
+			}
+
 			// Don't preload if it's marked for enqueue.
 			if ( true !== $script_module['enqueue'] ) {
 				echo sprintf(
 					'<link rel="modulepreload" href="%s" id="%s">',
-					esc_url( $this->get_src( $id ) ),
+					esc_url( $src ),
 					esc_attr( $id . '-js-modulepreload' )
 				);
 			}
@@ -262,14 +299,29 @@ public function print_import_map() {
 	 *
 	 * @since 6.5.0
 	 *
-	 * @return array Array with an `imports` key mapping to an array of script module identifiers and their respective
-	 *               URLs, including the version query.
+	 * @return array Array with an `imports` key mapping to an array of script
+	 *               module identifiers and their respective URLs, including
+	 *               the version query.
 	 */
 	private function get_import_map(): array {
-		$imports = array();
-		foreach ( $this->get_dependencies( array_keys( $this->get_marked_for_enqueue() ) ) as $id => $script_module ) {
-			$imports[ $id ] = $this->get_src( $id );
+		$imports           = array();
+		$script_module_ids = array_merge( $this->marked_for_inclusion, array_keys( $this->get_marked_for_enqueue() ) );
+
+		foreach ( $this->get_dependencies( $script_module_ids ) as $id => $script_module ) {
+			$src = $this->get_src( $id );
+			if ( null === $src ) {
+				continue;
+			}
+			$imports[ $id ] = $src;
 		}
+		foreach ( $this->marked_for_inclusion as $id ) {
+			$src = $this->get_src( $id );
+			if ( null === $src ) {
+				continue;
+			}
+			$imports[ $id ] = $src;
+		}
+
 		return array( 'imports' => $imports );
 	}
 
@@ -335,11 +387,11 @@ function ( $dependency_script_modules, $id ) use ( $import_types ) {
 	 * @since 6.5.0
 	 *
 	 * @param string $id The script module identifier.
-	 * @return string The script module src with a version if relevant.
+	 * @return string|null The script module src with a version if relevant.
 	 */
-	private function get_src( string $id ): string {
+	private function get_src( string $id ): ?string {
 		if ( ! isset( $this->registered[ $id ] ) ) {
-			return '';
+			return null;
 		}
 
 		$script_module = $this->registered[ $id ];
diff --git a/tests/phpunit/tests/script-modules/wpScriptModules.php b/tests/phpunit/tests/script-modules/wpScriptModules.php
index 85f9599f0dac3..f60666c6b8c52 100644
--- a/tests/phpunit/tests/script-modules/wpScriptModules.php
+++ b/tests/phpunit/tests/script-modules/wpScriptModules.php
@@ -34,7 +34,7 @@ public function set_up() {
 	 *
 	 * @return array Enqueued script module URLs, keyed by script module identifier.
 	 */
-	public function get_enqueued_script_modules() {
+	private function get_enqueued_script_modules() {
 		$script_modules_markup   = get_echo( array( $this->script_modules, 'print_enqueued_script_modules' ) );
 		$p                       = new WP_HTML_Tag_Processor( $script_modules_markup );
 		$enqueued_script_modules = array();
@@ -54,10 +54,12 @@ public function get_enqueued_script_modules() {
 	 *
 	 * @return array Import map entry URLs, keyed by script module identifier.
 	 */
-	public function get_import_map() {
+	private function get_import_map() {
 		$import_map_markup = get_echo( array( $this->script_modules, 'print_import_map' ) );
 		preg_match( '/<script type="importmap" id="wp-importmap">.*?(\{.*\}).*?<\/script>/s', $import_map_markup, $import_map_string );
-		return json_decode( $import_map_string[1], true )['imports'];
+		return isset( $import_map_string[1] )
+			? json_decode( $import_map_string[1], true )['imports']
+			: array();
 	}
 
 	/**
@@ -65,7 +67,7 @@ public function get_import_map() {
 	 *
 	 * @return array Preloaded script module URLs, keyed by script module identifier.
 	 */
-	public function get_preloaded_script_modules() {
+	private function get_preloaded_script_modules() {
 		$preloaded_markup         = get_echo( array( $this->script_modules, 'print_script_module_preloads' ) );
 		$p                        = new WP_HTML_Tag_Processor( $preloaded_markup );
 		$preloaded_script_modules = array();
@@ -906,4 +908,72 @@ public static function data_invalid_script_module_data(): array {
 			'string'   => array( 'string' ),
 		);
 	}
+
+	/**
+	 * @ticket 61500
+	 */
+	public function test_included_module_appears_in_importmap() {
+		$this->script_modules->register( 'dependency', '/dep.js' );
+		$this->script_modules->register( 'example', '/example.js', array( 'dependency' ) );
+
+		// Nothing printed now.
+		$this->assertSame( array(), $this->get_enqueued_script_modules() );
+		$this->assertSame( array(), $this->get_preloaded_script_modules() );
+		$this->assertSame( array(), $this->get_import_map() );
+
+		// After including, the importmap should be populated.
+		$this->script_modules->include_in_import_map( 'example' );
+		$this->assertSame( array(), $this->get_enqueued_script_modules() );
+		$this->assertSame( array(), $this->get_preloaded_script_modules() );
+
+		$import_map = $this->get_import_map();
+		$this->assertCount( 2, $import_map );
+		$this->assertArrayHasKey( 'example', $import_map );
+		$this->assertArrayHasKey( 'dependency', $import_map );
+	}
+
+	/**
+	 * @ticket 61500
+	 */
+	public function test_included_modules_concat_With_enqueued_dependencies() {
+		$this->script_modules->register( 'dependency-enqueued', '/dep.js' );
+		$this->script_modules->register(
+			'enqueued',
+			'/example.js',
+			array(
+				array(
+					'id'     => 'dependency-enqueued',
+					'import' => 'dynamic',
+				),
+			)
+		);
+		$this->script_modules->enqueue( 'enqueued' );
+
+		$this->script_modules->register( 'dependency', '/dep.js' );
+		$this->script_modules->register( 'example', '/example.js', array( 'dependency' ) );
+
+		// Only dependency-enqueued should be printed.
+		$enqueued = $this->get_enqueued_script_modules();
+		$this->assertCount( 1, $enqueued );
+		$this->assertArrayHasKey( 'enqueued', $enqueued );
+		$this->assertSame( array(), $this->get_preloaded_script_modules() );
+
+		$import_map = $this->get_import_map();
+		$this->assertCount( 1, $import_map );
+		$this->assertArrayHasKey( 'dependency-enqueued', $import_map );
+
+		// After including, the importmap should be populated.
+		$this->script_modules->include_in_import_map( 'example' );
+
+		$enqueued = $this->get_enqueued_script_modules();
+		$this->assertCount( 1, $enqueued );
+		$this->assertArrayHasKey( 'enqueued', $enqueued );
+		$this->assertSame( array(), $this->get_preloaded_script_modules() );
+
+		$import_map = $this->get_import_map();
+		$this->assertCount( 3, $import_map );
+		$this->assertArrayHasKey( 'dependency-enqueued', $import_map );
+		$this->assertArrayHasKey( 'dependency', $import_map );
+		$this->assertArrayHasKey( 'example', $import_map );
+	}
 }