Resistance (climbs/descents) on GPX route set through Garmin head unit - possible to sync speed directly to Gpedal?

Dear Chad, Thanks for the great app it let me relive a ride from my youth! Previously I just rode this route by having my Garmin head unit send the resistance data to the trainer. Is it possible to sync the speed of the trainer directly to Gpedal instead of estimating speed from power/cadence so that the imagery can sync up?

                  Thanks again for creating this! Jamil