How do I have my Treasure Enchant generate on looted items?

I've recently made a curse and I'd like it to be generated on treasure loot such as from End Cities. The only thing is it's not generating.

Could it be that it's not included in this filter present in all loot tables with enchanted gear?

"function": "minecraft:enchant_with_levels",
              "levels": {
                "min": 20.0,
                "max": 39.0,
                "type": "minecraft:uniform"
              },
              "treasure": true