QWidget background image from name in svg file

Not seeing doc on this. Please don't post solution where single svg is in file. We have many images in single svg file. Each image has a name. When using the renderer we can pull each image out by name.

What I am looking for is the syntax/method of setting a QWidget background image BY NAME.

":/svg"
"MyFileOfImages.svg"
"Image_22"

Is there a stylesheet syntax something like background-image: :/svg/MyFileOfImages.svg/Image_22" ?

Would prefer to set this in code not stylesheet as there is runtime overhead with stylesheet.

Thanks,