How would I make modified armor or tools a reward?

[raven peak]

I want to make it so when you are mining or digging and you get a reward there is a chance you get a piece of modified armor that has a trait. How would I add it to the loot table?

I sort of understand the key registry system but I don’t understand what I have to do after I register the gear

[wind marsh]

In the loot table instead of using a material: on an item loot use a key: [name] with the name you used to register it from the command