How to use item modifier (loot modifiers)

Hello, I’m trying to integrate a custom loot table into the existing Minecraft village chest loot tables (e.g., village_armorer.json) [end goal all chest loottable] without completely overriding the vanilla loot. My goal is to add extra loot while keeping the default chest drops intact. I would like someone to check my datapack to see if i am doing it correctly. Kind Regards, Wompi