Import the image into android studio and create different sizes

Question

So, in Android Studio there is a tool called activation studio, which is nice.

I am creating my first Android game and I know that there are different res folders for different DPIs.

You can let Android Studio generate different images from the same source image using Android Asset Studio. But only for launch icons, symbol icons, and action bar icons. How can I do this for the images I want to use in the game?