2d rigging and animation PNG

What’s the best method of rigging and animating png files. I’m using inkscape to create the art. I would use svg files but from what I can see there is no native or free way to use them. And I’ve tried using the animation 2d package with png files but looks like it only supports photoshop files.

There is a Unity package for importing vector graphics, see About Vector Graphics | Vector Graphics | 1.0.0-preview.34