[FOUND] How to add a custom lore (description to an item) ?

Find the "Special information" box in the visual section of item creation and then press the plus button to define it using a procedure. In this procedure, get the items durability and the other text you want, combine them into a single text variable and return it using the text return block.

I'm usually not a fan of just handing people procedures, but you want something like this: https://imgur.com/a/1s2FqxP