QGraphicsView's mapToScene() doesn't work with QPointF positions

QGraphicsView's mapToScene method does not work with QPointF coordinates. I am trying to add a drawing feature to a QGraphicsView for making handwritten notes using a stylus pen (-> tabletEvent ). To draw accurate lines, the event.posF() is required, but I cannot map it to the scene which I have to since scrolling and zooming is possible.

I haven't found a workaround for Python for this issue yet, if someone has one, it would be much appreciated.