AWS Amplify Flutter one to many relationship - graphql create - not working?

Question

I am new to AWS Amplify and GraphQL API. I created data models using Amplify Studio. Here is the schema.graphql:

type Language @model @auth(rules: [{allow: public}]) {
  id: ID!
  name: String
  fluency: String
  rpm: Float
  translatorID: ID @index(name: "byTranslator")
}

enum TranslatorTime {
  FULLTIME
  FREETIME
  PARTTIME
}

type Translator @model @auth(rules: [{allow: public}]) {
  id: ID!
  userId: String
  time: TranslatorTime
  Languages: [Language] @hasMany(indexName: "byTranslator", fields: ["id"])
}

I am using graphql api on flutter app to create items in translator model, here is the code i tried:

Future<void> addTranslator(Translator translator) async {
    try {
      final request = ModelMutations.create(translator);
      final response = await Amplify.API.mutate(request: request).response;

      final createdTranslator = response.data;
      if (createdTranslator == null) {
        safePrint('errors: ${response.errors}');
        return;
      }
      safePrint('Mutation result: $createdTranslator');
    } on ApiException catch (e) {
      safePrint('Mutation failed: $e');
    }
  }

But the problem is when i create translator item, the list of languages is not saved in the database, since the translator has one-to-many relation with language, its not working, in both tables translator and language. I am creating list of language and passing to the language model. The mutation result is:

Mutation result: Translator {id=156a3fd4-ae09-4579-977c-0ca4bb205aca, userId=7d8d034e-d13c-4f53-87c4-4f4bb9adfe03, time=PARTTIME, createdAt=2023-02-06T10:05:52.329000000Z, updatedAt=2023-02-06T10:05:52.329000000Z}

it does not have Languages. Tried with translatorId and without it.