Clickthrough v1.0
You know when you want nicely labeled storage, but your Item Frames always get in the way of opening chests?
No more!
Clickthrough allows players to simply click "through" item frames that are placed on chests, barrels, furnaces, etc. Basically, any block that has an inventory. Clicking on the item frame without sneaking simply opens the container the item frame is attached to. The item frames can still be modified by sneaking.
More precisely (and technical)
To be precise, players can click through any Entity whose type is or extends org.bukkit.entity.ItemFrame, given that it is placed on a block, of which its BlockState (block.getState()) is or implements org.bukkit.inventory.BlockInventoryHolder.
Client Side Alternatives
If you are just looking for a client side alternative, there is a fabric mod clickthrough.