Would love to have the Galaxy Watch Designer as a mobile app (Android) instead of Windows App.
I think this particular topic has been discussed before, and the moot point was it being a Java based software
which did not go agree with the android app style of working.
As Malcolm said GWD use the Java based Eclipse IDE and requires the Java Runtime Environment and there is not Java SE for Android.
I do not see this changing so there is no use in submitting a feature request.
Samsung Developer Program