Official working way to include the source maps running on Android? (Ionic v4)

In Chrome inspector I cannot see the source code e.g. in error messages. Because the source map is not handled by Ionic when running on Android using following command:

ionic cordova run android --sourceMapType #inline-source-map --generateSourceMap true

(with or without the --sourceMapType inline parameter)

Is there an official working way?
Currently is it horrible to debug my app without a source code in developer build.

I prefer a non-hack solution. But I would be happy for everything.

"@ionic-native/core": "^5.0.0",
"@ionic/angular": "^4.7.1",
Ionic CLI: 5.2.5