Warm-up & Cool-down Ramps in ERG Mode

Hi there.

I recently started using my Edge 830 to do indoor workouts on Zwift, which is convenient as this allows me to do a workout during a group ride. The question I have is, is it possible to program in a ramp up from, say 50% - 75% FTP at the beginning of a workout? Only way I've been able to do it is with manual 1-minute segments that gradually increase, but it would be easier to be able to write one 10-minute interval with a ramp, similar to how some Zwift workouts begin.