@StravaAs times goes by ... first request to show heart rate data on swim activities is from November 2015, i.e. almost 4 years (!) and ...it still not present and, even worse, no reaction from you...
+1 for HRM swim data from Garmin. Thanks for considering running data within "Fitness & Freshness" now. For triathletes it would be great to have also swimming data included.