Use flavor / buildTypes / productFlavors / options for App Engine with Gradle?

Question

I want to be able to create both the dev / prod option for the App Engine backend, and because I want to exchange one file for the development server. So something like this (Pseudo Code):

flavors { dev prod extends dev // uses folder 'prod' that overrides some files } 

Is there a way to do this using the default appengine plugin? I cannot find anything useful in the Read Engine Engine .

Thank you for help!