src/main/resources/builtin/loot/entities/enderman.json

{
  "items": [
    {
      "default": {
        "count": {
          "max": 1
        },
        "item": "ender_pearl"
      }
    },
    {
      "default": {
        "count": 1,
        "item": "$.getCarriedMaterial().getItemType().name()"
      }
    }
  ],
  "experience": {
    "count": 5
  }
}