After being a premium member for a couple of years I cancelled last year because of this problem. I see Strava have done absolutely nothing to fix it even though they were obviously aware of it nea...
Yep - I've now cancelled my Strava Premium because this still isn't a thing. As a Triathlete and Open Water swimmer, this is a fundamental requirement!
It's a bit of a missing link here - if the data is in Garmin, why can't it just be brought across as-is? I use a HRM-Tri which shows heart rate fine on Garmin Connect but nothing on Strava.
I'm totally surprised this isn't a thing yet - if we can do it for Matched Runs, surely it should be capable for Matched Rides?