QML Image element does not allow to bind source to QImage property of QObject

Although the documentation clearly mentions that the source-property of an QML image element is an URL, I am expecting to be able to do this:

I have a c++ model that gets exposed to a qml context. It has an image property:

Q_PROPERTY (QImage background READ background)

This property changes over time and it might be generated inside my application, so there is neither a public URL on the internet nor a local file on the filesystem.

Now I want to display that image in a QML scene like this:

Image

qrc:/resources/main.qml:8: Unable to assign QImage to QUrl

which is a correct conclusion but anyway I want to do this. I have seen other bug reports that seem to go into the same direction(using application generated images in qml) but involve custom image loaders etc. I don't see why this would be necessary and I am voting for such a simple solution like proposed above.