any way to add NBT data?

[UsefullSpoon]

I am trying to put sellwands up the shop but the sellwands just don't work when i buy them, i ran /bs read to get the important information but i can't seem to figure out how to also extract the NBT data

[zThana]

After looking around, it seems that it hasn't been implemented and/or it broke somewhere along the way. Would like this to be looked into