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

{
  "items": [
    {
      "default": {
        "item": "bone",
        "count": {
          "max": 2
        }
      }
    },
    {
      "default": {
        "item": "arrow",
        "count": {
          "max": 2
        }
      }
    }
  ],
  "experience": {
    "count": 5
  }
}