Member

{
  "fields": {
    "owner": "user_id"
  }
}

{
  "fields": {
    "owner": {
      "userId": "user_id",
      "name": "Ada Lovelace",
      "email": "ada@example.com"
    }
  }
}

{
  "fields": {
    "owners": [
      "user_ada",
      "user_grace"
    ]
  }
}

{
  "fields": {
    "owners": [
      {
        "userId": "user_ada",
        "name": "Ada Lovelace",
        "email": "ada@example.com"
      },
      {
        "userId": "user_grace",
        "name": "Grace Hopper",
        "email": "grace@example.com"
      }
    ]
  }
}