How to add arguments to command line for iOS builds with GMS?

I'm trying to run my iOS build with the following command line argument in Xcode : -FIRDebugEnabled.
Every time I build with GMS, I must do the following in Xcode:
  1. In Xcode, select Product > Scheme > Edit scheme...
  2. Select Run from the left menu.
  3. Select the Arguments tab.
  4. In the Arguments Passed On Launch section, add -FIRAnalyticsDebugEnabled

Any one know how to add arguments passed on the launch command line within Game Maker Studio so that I don't have to do this every time I build?