{
  "type": "minecraft:entity",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "item",
          "name": "player_head",
          "functions": [
            {
              "function": "fill_player_head",
              "entity": "attacker"
            }
          ]
        }
      ]
    }
  ]
}