```swift
extension GraphQLRequest {
    static func get(byPostId postId: String, todoId: String) -> GraphQLRequest<JSONValue> {
        let document = """
        query get($postId: ID!, $todoId: ID!) {
          getPost(id: $postId) {
            id
            title
            rating
          }
          getTodo(id: $todoId) {
            id
            name
          }
        }
        """

        return GraphQLRequest<JSONValue>(
            document: document,
            variables: [
                "postId": postId,
                "todoId": todoId
            ],
            responseType: JSONValue.self
        )
    }
}
```
Notice here that `JSONValue` is used as the `responseType`. `JSONValue` is utility type that can be used to represent an arbitrary JSON response.

Once you have the response data in a `JSONValue`, you can access each object in the JSON structure by encoding it back to Data and decoding it to the expected Model.

```swift
do {
    let response = try await Amplify.API.query(request: .get(byPostId: "[POST_ID]", todoId: "[TODO_ID]"))
    switch response {
    case .success(let data):
        if let todoJSON = data.value(at: "getTodo"),
            let todoData = try? JSONEncoder().encode(todoJSON),
            let todo = try? JSONDecoder().decode(Todo.self, from: todoData) {
            print(todo)
        }
        if let postJSON = data.value(at: "getPost"),
            let postData = try? JSONEncoder().encode(postJSON),
            let post = try? JSONDecoder().decode(Post.self, from: postData) {
            print(post)
        }
    case .failure(let errorResponse):
        print("Response contained errors: \(errorResponse)")
    }
} catch let error as APIError {
    print("Failed with error: \(error)")
} catch {
    print("Unexpected error: \(error)")
}
```

If you have custom models or your Model has required fields that you have decided not to include in the response, you can create a `Codable` that conforms to the structure of the response data that you expect. From the previous example, the `Codable` would look like this

```swift
struct PostAndTodoResponse: Codable {
    public let getTodo: Todo
    public let getPost: Post
    struct Todo: Codable {
        public let id: String
        public var name: String
    }
    struct Post: Codable {
        public let id: String
        public var title: String
        public var rating: Int
    }
}
```
Then use `PostAndTodoResponse` as the `responseType` of the `GraphQLRequest` instead of using `JSONValue`.