How to render a QQuickItem offscreen on a QQuickRenderControl from a C++ function

[Roby Brundle]

I am using QQuickRenderControl to render some texture using an QOffscreenSurface. This is very much dependent on the Qt official example for
QQuickRenderControl

How can I offscreen render individual QQuickItems to this QQuickRenderControl.

I have the QQmlApplicationEngine pointer & easily get a qml object in C++ function like so:

QQuickItem * my_qml_item = QmlEnginePointer->rootObjects()[0]->findChild<QQuickItem*>("MyQMLItemObject");

How can I render my_qml_item into my QQuickRenderControl from a C++ function?

PS: I have the QOffscreenSurface set up to take care of the refresh etc. I just want to know how to render any QQuickItem on this QQuickRenderControl.