Config_id for Flutter project_type in

Need to create app with project_type: flutter

When I do request I get:

In description Bitrise Swagger UI for /apps/{app-slug}/finish I can see:

config string

Which config to use default-android-config , default-cordova-config , default-fastlane-config , default-ionic-config , default-ios-config , default-macos-config , default-react-native-config , default-xamarin-config , other-config (default if parameter is not speficied)

But there is no any default-flutter-config

Is there way to finish creating app via api for project_type: flutter?