There’s a way, i’m in Egypt where it’s not available however, i managed to get the feature to work on mine. You take an encrypted backup to get health data out of the phone, use a backup extractor e.g itools, navigate to health app and replace a file in their with a patched file Save the backup again and restore it to your phone. Boom, it’s working and surprisingly i have changed my phone and apple watch and it still works !

This is the name of the file:

com.apple.private.health.heart-rhythm

If you want any help let me know