How to do delete later in QML JavaScript?

[jesseQt]

I have a VideoThumbnail class inherits from QQuickItem, used in QML.
VideoThumbnail has a callback thread which may post update event while
the VideoThumbnail object is being destroyed, this race condition could incur crash.
From what I read, deleteLater is needed, since JavaScript cannot call deleteLater
directly, I create a Q_INVOKABLE method say DeleteMeLater in VideoThumbnail class
and call deleteLater in the method.
In QML JavaScript, it looks like
VideoThumbnail {
id: videoThumbnail
...
Component.onDestruction:{
videoThumbnail.DeleteMeLater()
}
}

Has anyone here done this before and could provide suggestions?
Also is Component.onDestruction DirectConnection? and I assume destruction is emitted
before any destruction starts?

Delayed destroy is not the solution I am looking for.

Thanks