Item_model in loot tables

Hello I am working with the item_model tag on items to have them display as custom items and its working great. I have all of my custom items working how I want but when wanting to spawn them in loot tables I am able to set all the nbt how I want but I cant quite get the item_model to be set. I cant see any function to apply an item_model onto it. This is what I have { "type": "minecraft:item", "name": "minecraft:sugar", "weight": 2, "functions": [ { "function": "set_name", "name": { "text": "Shulkers Grace", "italic": false, "color": "yellow" } }, { "function": "set_attributes", "modifiers": [ { "attribute": "minecraft:safe_fall_distance", "id": "shulkers_grace_speed", "amount": 1, "operation": "add_value", "slot": "offhand" } ] } ] }