InfoDataPack - Tooltips and Information via Datapacks
This mod enables adding tooltips and item descriptions in JEI through specialized datapacks. It's particularly valuable for modpack creators who want to provide players with detailed information about items.
With InfoDataPack, you can create hover tooltips for items and add comprehensive descriptions in the JEI (Just Enough Items) interface.
Hover Tooltips

JSON text for tooltips can be generated using online tools like minecraftjson.com or minecraft.tools. For working with the SNBT part of items, SNBT Editor is recommended.
JEI Information

Examples of datapack structure and files are available in the project's GitHub repository. There you'll also find ready code examples for quick start.
The mod is fully compatible with any modpacks and can be freely used in them.