Helipaddy are about to release a Skydemon > Garmin flight plan converter app. This takes a SkyDemon .flightplan file and opens it up in Garmin Pilot, so the whole process happens on mobile. Then you send the Flightplan to your avionics in the cockpit with FlightStream.
Helipaddy have already released a feature that lets you store unlimited waypoints on Helipaddy for free. You can then export these to Garmin Pilot, Garmin Aera, Garmin GTN series and SkyDemon.