Hmm, one alternative solution ...
Open the app > main menu > All features > Tools > Quick bookmark.
Here tap on "+" and choose "Add new".
As a URL template define whatever will work for you, but you should start with "geo:0,0?q={mapLat},{mapLon}(text)".
Target application at the bottom, choose your Garmin app, it should be available. If not, it should work even without it. Give it a try.
Open the app > main menu > All features > Tools > Quick bookmark.
Here tap on "+" and choose "Add new".
As a URL template define whatever will work for you, but you should start with "geo:0,0?q={mapLat},{mapLon}(text)".
Target application at the bottom, choose your Garmin app, it should be available. If not, it should work even without it. Give it a try.