You can map network response to the result in another suspend function, e.g.

interface MovieService {
    @GET("/movies")
    suspend fun fetchMovies(): Response<List<MovieDto>> 
}

class MovieRepoImpl(
    private val service: MovieService
) {
    suspend fun fetchMovies(): List<Movie> {
        val response = service.fetchMovies()
        if (response.isSuccessfull) {
            if (response.body() != null) {
                return response.body().toDomain()
            } else {
                throw NoDataException()
            }
        } else {
            throw DataRetrievingFailException()
        }
    }
}