At present, there are only an icon element and splashscreen element that handles copying images from a source to destination in the config.xml. These elements also only handle copying 1 image only and replacing what was previously there as the icon.png or splash.png.
I'm creating a new tag that will copy non-main app icon images, which could be notification icons, button icons, custom image text, etc. and not limited to just 1 image.
<image src="res/android/notification.png" name="notification.png" />
<image src="res/android/notification-mdpi.png" name="notification.png" density="mdpi" />
The required attributes will be src and name.
Depending on the directory that the image gets copied to, the width and height attribute may not be needed.