Garmin basically closed off all access to 3rd party training platforms sending data to Garmin Connect, after they acquired Tacx. Thus, it pretty much just remains TrainerRoad & Zwift since that point (others like FulGaz have asked repeatedly).
Short of a (pretty substantial) policy shift, I doubt we’d see MyWhoosh getting push access (pushing into Garmin Connect). There’s a long list of bigger companies that would like that, first.