Setting QGLWidget as the viewport to QGraphicsView with eglfs

Hi! Is it possible to set the QGLWidget as the viewport to
QGraphicsView when using the eglfs platform plagin? When I do that I
get:

This plugin does not support setParent!

The code seems to go on, but nothing appears on the screen.
Final goal is to be able to get QGraphicsWebView to work using the
OpenGL ES 2 paint engine. I'm trying to use QtWebKit this way to use
the single process version of QtWebKit.
Is it possible somehow?

Luca