Alternative power meter source for workouts controlled via Edge computer, Ant+

So I've had issues with Zwift crashing so am resorting to garmin connect workouts from an edge 520 and the tacx s.  BUT, I want to control the workout to my crank based power meter and not the Tacx reading of power.  Is this possible?  Basically the same thing that Zwift allows and TR, etc, but within the Garmin ecosystem.