Is there a way to add a loot table to a modded chest when it generates?

So, I have a locked chest and when I used a key on it the key disappears and the locked chest gets replaced by an unlocked version it (also there is a keyblade version of the key that uses durability instead of disappearing). I want the unlocked chest to spawn with custom loot table items but I'm not sure how to do it. Here is what I have so far: