little shard
I spent way too long trying to find something that actually works, and every time I found what I was looking for, it had to be downloaded on curse forge and I still haven't found a way yet to get it to work on lunar.
So what I'm suggesting is a mod where u hover over a shulker and the player can view its contents, but it has to be client side, similar to what xisumavoid uses in Hermitcraft