Qml Builder, get binding

Hi all,

I'm literally building a Qml builder, a bit like the Qml Designer.

I do have a qml file loaded as a my main.qml and a c++ backend on my program. So far so good, I can drag and drop item, I can drag the item once drop over a rectangle resize and everything. On the right of my program, I have a list of properties and I can type something in, and the Item will be updated as wanted.
I load the qml I want to modify with a "Loader" item, and it works fine. The problem is when I want to read the property of Items loaded, I read a number or a text, which is fine. but what if the property is a binding ? I still read a number ...

I'm looking at something to tells me that it's not just a number but a result coming from an expression, and if possible refund this expression.
Does anyone face the same problem as me ?

Thanks!