[[qanda:topic_unsolved]] WebEngine - How to draw an animated SVG above a transparent web view?

On a Qt Quick interface, I need to show a complex animated SVG image. As the standard SVG module didn't support the SVG I want to show, I tried to use a WebEngineView as a component to achieve my drawing.

All works fine except that I cannot change the background color. I need my image to be shown above a colored background, however the image background is always white.

I tried the following code:

WebEngineView
{
    id: wvWebEngineView
    anchors.fill: parent
    backgroundColor: "transparent"
    url: "qrc:/Resources/Images/tbackupextractor/im-loading-animation.svg"
}

This resolve the transparency issue, however the background is no longer cleared, and this result to a completely insane drawing:

So how can I both turn my page background transparent AND show an animated SVG on it?