json_schema: {
    "properties": {
      "person1": {
        "properties": {
          "birth_date": {
            "description": "The birth date of person 1",
            "type": "string"
          },
          "name": {
            "description": "The name of person 1",
            "type": "string"
          }
        },
        "type": "object"
      },
      "person2": {
        "properties": {
          "birth_date": {
            "description": "The birth date of person 2",
            "type": "string"
          },
          "name": {
            "description": "The name of person 2",
            "type": "string"
          }
        },
        "type": "object"
      }
    },
    "required": [
      "person1",
      "person2"
    ],
    "type": "object"
  }