Quote Originally Posted by cmessineo View Post
The QML is not known by me, I don't know what other people will create, so I have to find the child item and update a property if I can
So how do you know that the item exists?

I agree with wysota, this sounds like a very broken setup.

The cleanest and incidentally at the same time easiest way is to export an object with the data property as a context property and let the QML side use it wherever it wants to.

Cheers,
_