I'm waiting for this as well in Austria. As the D2 Mach 1 Pro can do this in the US it should now also be released for this model in Europe. As well for my old Venu 2 Plus!
I received ECG function for my D2 Mach 1 Pro on March 1st
The Update was rolled out with the 20.17 to Germany -> Also other good improvments included. Thank you Garmin :)