IMHO the easiest way to load routes into Garmin (which supports ConnectI Q apps) is to use routeCourse app: https://apps.garmin.com/en-US/apps/b...3-474e97f376ac

Works not only for RWGPS routes but for pretty much everything: "can import route URLs from connect.garmin.com, ridewithgps.com, strava.com, mapmyride.com, mapmyrun.com, gpsies.com, outdooractive.com, bikemap.net, openrunner.com, mtbproject.com, hikingproject.com, trailrunproject.com and gpstracks.nl.... GPX, TCX or KML/KMZ file".