Setting Dark Mode in App

Hello,   I am trying to make a button that turns my app into dark mode if it's currently in light more or vice versa. I see there are some variables in the native styling file of custom-variables.js. However, how do I set my app to be in dark mode? I assume it would be through a microflow but not sure how to get into the js file to call something.   Not 100% sure if this is the correct way to make my app have dark mode, and if there is an easier way I am all ears.   Thanks, David
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