Thank you, I have used RGB and Hex, both work well. 

What does not work is the ability to define "navigationBarColor" in Theme.js  I would like "navigationBarColor" defined so that it is dynamically changed with Day/Night mode on Android. 

This is a "Bug" that has not been coded for in the mobile app.

Haven't tried that one yet. Maybe Una team can help. As it will need a switcher for dark and light mode.

This dude is awesome.. he does good work!!