Honestly I would just keep doing Android work using Kotlin. I learned Kotlin by writing an Android app and I’ve never even written one in Java. With Android Studio, you’ll have all your tooling, file structure, and everything automatically set up. When I tried to do that with IntelliJ for a command-line Kotlin app later, I found the process confusing by comparison. Then I had to figure out which DB lib to use etc etc.
Better to just do an Android app with Kotlin and already know you’re going to use XYZ for accomplishing ABC because it’s what Android provides for you already.