make modded items appear in dungeon chests (1.16.1)

I've already registered my item and it show up the the creative inventory fine but I can't get it to spawn in a dungeon

here's my code:

{
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "item",
          "name": "ruby_items:ruby_matter_core",
          "weight": 100
        }
      ]
    }
  ]
}

and the json is in Ruby Items 1.16.1-1.0.0/src/main/recources/data/ruby_items/loot_tables/chests/simple_dungeon.json

was I supposed to write anything in the code? because my class file is empty

package com.mani_cwaf.ruby_items.items;

import com.mani_cwaf.ruby_items.Ruby_Items;
import net.minecraft.item.Item;

public class RubyMatterCore extends Item {
    public RubyMatterCore() {
        super((new Properties().group(Ruby_Items.TAB_RUBY)));
    }
}

Edited August 31, 20214 yr by Unkn0wn4all