There are no technical limitations, from what I understand, this is just a choice of a platform locking
Hey @Pbase!
While we don’t have plans to change our TrainingPeaks integration, we are working to improve Calendar by expanding on the types of activities that can be imported into the TrainerRoad Calendar.
You can now import and display running activities in your TrainerRoad account on the TrainerRoad website. Runs can be imported manually into TrainerRoad or pulled automatically from Strava or Garmin Connect via Ride Sync. We are continuing to improve this and making good progress! You can read more about this here: How to Import and Display Runs in TrainerRoad.
Let me know if you have any questions about this! 