I haven’t tried this out in practice yet, but in theory it’s easy to program the 30-20-10 into your Garmin via the app.
Go to: more (bottom right); training; workouts; create a workout; run; and then pop in your warm up/run/cool down according to distance, time (or other parameters). There is a big blue button for adding repeats.
How well this will work on the road, who knows. I’m assuming the watch is going to buzz at me. I hope I don’t get confused and try sprinting for 30 seconds!
Good luck peeps.