Android Studio - multi-line additionalArgs?

I'm trying to build a Flutter app in Android Studio. We're using VSCode with quite many dart-define's in .vscode\launch.json. In Android Studio, I think, we should use Build Configuration - Additional run args. The problem with it, however, is that it's a single line edit and it's too cumbersome to manage the many defines that in VSCode are easily accessible via regular text editor Is there a better way to do this? Like, reference an external file and load the defines from there? The IDE saves the entire string as an xml attribute in workspace.iml, so I can't just edit that as well.

In that window, you will see a small expansion array on the far end of the textbox. You should click it to get a multi - line sort of view for the args