WindowXML – PIL Image

Hello, I hope I am in the right forum (wasn’t sure if it is a skinning or addon related problem).
I am working on an addon to control my Mopidy Server (with spotipy integration) and made a GUI with WindowXML:

I’d like to set the background to a blurred version of the cover. I figured out how to blur an image with PIL, save to the disc and set it as the background, but the performance is not ideal.
Is it possible to directly set the PIL image as an Image Control, thus eliminating the need to save it locally?