Hello! I maintain the Item Descriptions mod, which adds descriptions to all blocks, items, and entities. I add compatibility for various informational mods, including Jade, WTHIT, and Limelight. I was looking to add support for Useful Spyglass as well, but since there wasn't an API, my dev branch has support added via a mixin.

I was originally planning on making this a PR, but I wasn't able to get the mod correctly added as a dependency. Proof of concept screenshot below:

I'll try and get this in for the next 1.21.1 release along with possible jade integration, whenever it happens.