Flutter: add flavors configuration into Visual Studio

My flutter application has different flavors. In Android Studio everything is setup in the flavor configuration panel, but where can I do that in Visual Studio Code?

I guess I have to edit the configuration.json but I cant find any reference online on how to do it.

I do not want every time to type flutter run --flavor app1 -t lib/main_app1.dart

You can pass additional arguments using a launch.json. If you don't already have one, click the Cog icon in the Debug sidebar and then select Flutter in the snippet-completion list. You can then add an args section, like this:

{
    "name": "Flutter",
    "request": "launch",
    "type": "flutter",
    "args": [
        "--flavor",
        "app1"
    ]
}