Since TR running imports still expect people to use Strava unfortunately (Hey TR, how about supporting Intervals.icu or HealthFit???) I’ve found a work around to avoid that. If you run with an AppleWatch and in addition have a Garmin or two or three, you can use RunGap on iOS to sync it to your Garmin account as a fake Garmin 945 watch and Garmin will in turn share it with TR. Not ideal, but it works.
There’s also a nice AppleWatch running program that supports TrainingPeaks and FinalSurge structured workouts. It’s called Watchletic. Just tried it today, worked nicely and supports Apple’s running power and run dynamics. All of that got synced to HealthFit which exported it to intervals.icu , TP and FS. Healthfit can actually export to Dropbox. One alternative would be for TR to import from dropbox FIT files.