Similar to https://bicycles.stackexchange.com/questions/56338/how-can-i-combine-garmin-recorded-track-data-with-fitbit-heart-rate-data

I have a Wahoo SC Blue to track speed and cadence and use the Wahoo app to log my ride (it has a nice dashboard). The completed workout gets synced to Strava. I also have a Fitbit Versa 2, but I don't log the ride on the watch as if I did, I'd end up with 2 activities on Strava.

What I'd like to do is use the heart rate data from the Fitbit, and 'inject' it into the Wahoo logged workout that appears in Strava. 

I guess what I'm looking for is some sort of activity merge feature on Strava, where I can take the GPS, speed and cadence data from Wahoo, and overlay the HR data from the Fitbit based on the timestamp. Is this possible? Or am I into the realms of exporting `TCX`/`CSV` data from separate sources, and re-uploading the data to Strava?