Maybe I wrote this suggestion into a wrong place - if yes sorry for it.
I checked some application and Google pages relating to the title but dod not find any result.
The idea is to be visible the Google maps and iOS maps navigation direction on the Garmin watches. (to me would be necessary this function on my FR235 and iPhone :) )
So the use case:
Open the Google maps on the phone
Setup the destination
The navigation information became visible on the watch (active BT connection, app had been installed and running on the watch)