With the addition of bundles, you can preview the items inside inventory items, so I was thinking it would be a nice implementation.
Especially when you use them for inventory management, ts really hard to keep track of them if there is a lot in your inventory.

Or if that is not possible, could you make it compatible with Quark shulker inventory preview?
IE stores the contents of the crate under the inventory NBT tag, instead of BlockEntityTag, that Vanilla shulkerboxes use. Because of this quark "can't find" the inventory contents, so it won't render them as a tooltip.