Now that there is a native data field for GAP (Grade Adjusted Pace https://support.garmin.com/en-US/?faq=BAoTNwybG874OFTrWhzlq8), why is it not possible to create workouts using that metric?
I am using a training website called https://aiendurance.com/, which loads running workouts to Garmin in either running power (which I cannot / don't want to use, because I am using Stryd for power), or in GAP (which the watch displays as normal pace instead, as you cannot create GAP workouts).