@Bill_C To get something into the Wahoo Cloud it has to be done on a Wahoo device or app - so using the Rival watch, the Bolt or Roam bike computer, the Wahoo Fitness app or doing a workout on SYSTM or RGT.
RGT does allow you to email workouts that you or a coach create using a workout builder like Training Peaks. Email the .ZWO or FIT file to workouts@rgtcycling.com and they will appear in the workout section of the app and you can pick whatever road you want to ride them on and when completed they will post to the Wahoo Cloud.
Prior to getting the Rival watch I used the Wahoo Fitness App on my phone to record strength and running workouts and it worked well. I was dual recording with a Suunto watch and uploaded to Training Peaks as well. Since getting the Rival the process has been more efficient.
The long term plan per prior posts in the forum is to be an open platform but for now there is also a browser extension that allows one workout per day to be exported to a non-Wahoo device. I have used it to export workouts to RGT and it works well.
Hope that helps!