Garmin expands its ECG app to more smartwatches - Android Authority

Availability still very limited:

https://support.garmin.com/en-US/?faq=QssFZHtIOfAYNSSmzXNwY9

Garmin's ECG app is currently available in the following regions:

        United States
       American Samoa
        Commonwealth of the Northern Mariana Islands
        Guam
        Puerto Rico
        US Virgin Islands
    Hong Kong
    Philippines
    Singapore
    Taiwan
    Vietnam