Show nbt number in item description.

Hello, I'm creating a mod to store the number of player's xp levels in an object (by the way, if you have the solution so that I can save the number of xp points instead of the number of levels, I I'm interested), and I want to include the NBT tag number of the item in its description, I know there are already threads for this, but they don't seem to work for version 1.19.2 for the software

(the name of the NBT tag is "XP")