Graphql get direct requested model

I implemented a sample of Graphql by Retrofit. I have a response like this:

                if (response.isSuccessful) {
                Log.e("response", response.body().toString())

Also, this is my interface class:

suspend fun postDynamicQuery(@Body body: String): Response<String>

Now I want to change my method by giving a direct model. this is the servers' answer.

{
"data": {
    "getCityByName": {
        "id": "112931",
        "name": "Tehran",
        "country": "IR",
        "coord": {
            "lon": 51.4215,
            "lat": 35.6944
        }
    }
}

To give a model answer, I should have a model like this:

data class CityModel(
    val data: Data
)

data class Data(
    val getCityByName: GetCityByName
)

data class GetCityByName(
    val id: String,
    val name: String,
    val country: String,
    val coord: Coord
)

data class Coord(
    val lon: Double,
    val lat: Double
)

And these two changes:

                if (response.isSuccessful) {
                cityModel = response.body()}

and

suspend fun postDynamicQuery(@Body body: String): Response<CityModel>

PROBLEM: I want a city model without creating a Data model and a CityModel model. this is a boilerplate to make two extra models for each API.

• I used GsonConverterFactory for converting to model:

        .addConverterFactory(ScalarsConverterFactory.create())
        .addConverterFactory(GsonConverterFactory.create())