In that case i could help you out a bit.
The plugin you are looking for is YEP_ItemCore.
As for the labeling of items, weapons and armors that's gonna be a bit trickier.
There's 2 ways to go about this:
1. Edit all the items, weapons and armors inside rpg maker with the appropriate menu category in the "note" section in bottom right.
You can see how it's done in termina if you look at the items.
2. Painfully editing the json files from the data folder by hand, this is not recommended since it's pretty messy to work with.
Whichever way you decide to go about this it's a matter of replacing the Items, Weapons and Armors JSON files from the data folder of the game, just make sure to have a copy of the originals left around.
And if you decide to replace the JSON files or write them by hand don't have the project open in rpg maker, otherwise there's a risk of data corruption.