QUESTION: Is it possible to use an existing graphQL API not built with Amplify backend? about amplify-flutter HOT 2 CLOSED

  Future<Customer?> getCustomer() async {
    try {
      const document = '''
          query GetCustomer(\$customerId: ID!) {
              getCustomer(customerId: \$customerId) {
                  id
                  email
                  status
              }
          }
      ''';
      const variables = {"customerId": "abcdefg"};

      final call = await Amplify.API
          .query(
              request: GraphQLRequest<dynamic>(
            document: document,
            variables: variables,
          ))
          .response;
      final responseRaw = call.data;
      print(responseRaw);

      final customerDynamic = jsonDecode(responseRaw)['getCustomer'];
      print(customerDynamic);

      final customer = Customer.fromJson(customerDynamic);

      return customer;
    } on ApiException catch (e) {
      safePrint('Query failed: $e');
      return null;
    }
  }

{"getCustomer":{"id":"abcdefg,"email":"[email protected]","status":"ACTIVE"}}
{id: abcdefg, email: [email protected], status: ACTIVE}
Customer {id=abcdefg, [email protected], status=ACTIVE, createdAt=null, updatedAt=null, queryResultsCustomerResultsId=null}

  StreamSubscription<GraphQLResponse<String>>? subscription;

  void subscribe() {
    const document = '''
      subscription SubscribeToRealtimeEvent(\$channel: String!) {
        subscribeToRealtimeEvent(channel: \$channel) {
          channel
          data
          date
        }
      }
    ''';
    const variables = {"channel": "123456"};
    final subscriptionRequest = GraphQLRequest<String>(document: document, variables: variables);

    final Stream<GraphQLResponse<String>> operation = Amplify.API.subscribe(
      subscriptionRequest,
      onEstablished: () => safePrint('Subscription established'),
    );
    subscription = operation.listen(
      (event) {
        safePrint('Subscription event data received: ${event.data}');
      },
      onError: (Object e) => safePrint('Error in subscription stream: $e'),
    );
  }

Subscription event data received:
{"subscribeToRealtimeEvent":{"channel":"123456","data":"{\"action\":\"ACT_ON_RESPONSE_RECEIVED\",\"params\":{\"itemId\":\"000000001\"}}","date":"2024-03-21T18:45:30.343Z"}}

Error: ApiOperationException {                                                                                                                                                                                                              
  "message": "Decoding of the response type provided is currently unsupported",                                                                                                                                                             
  "recoverySuggestion": "Please provide a Model Type or type 'String'"                                                                                                                                                                      
}