Is it possible to use the Garmin Coach feature when running indoors on a treadmill?

I couldn’t figure out how. If I start the scheduled coach run it asks me if I want to start running without gps. 

Is there a way to tell to this coach that I run indoors, and I even use a running dynamics pod? 

I don’t know what it would be the difference between running on a treadmill and outdoors from the coaching standpoint 

Garmin support told me that it’s not possible. I really need this feature during Canadian winters when it’s not possible to run outdoors in 3 feet of snow