phantom.json

{
  "type": "minecraft:entity",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "functions": [
            {
              "function": "minecraft:set_count",
              "count": {
                "min": 0.0,
                "max": 1.0,
                "type": "minecraft:uniform"
              }
            },
            {
              "function": "minecraft:looting_enchant",
              "count": {
                "min": 0.0,
                "max": 1.0
              }
            }
          ],
          "name": "minecraft:phantom_membrane"
        }
      ],
      "conditions": [
        {
          "condition": "minecraft:killed_by_player"
        }
      ]
    },
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "name": "minecraft:elytra",
          "conditions": [
            {
              "condition": "minecraft:damage_source_properties",
              "predicate": {
                "source_entity": {
                  "type": "minecraft:shulker_bullet"
                }
              }
            }
          ]
        }
      ]
    }
  ]
}