I know that I can right-click on res folder, select "New > Image asset" but while it allows me to select type of added icon it assumes that I want to add an icon.
I know that I can manually generate images and move them into drawble-mdpi, drawable-hdpi, drawable-xhdpi but I assume that it is possible to automate it and supply single image that will be scaled to create lower-resolution versions.
I know about Fast ways to import drawables in Android Studio? but it was not restricted to built-in options and an accepted version is plugin that received last update in 2016 and appears to be no longer maintained - NullPointerException report received no response from maintainer.