Create a QML Rectangle inside a Text object from c++

[Katlin]

How can I create a Rectangle inside a Text object, from c++ ?
The purpose is to be able to see the actual label position and especially size, in order to debug it.

In QML I would do:
@
Text{

id:some_text
text:"some text here"

Rectangle{
    id:the_border
    anchors.fill:parent
    border.color:"#000000";
    color:"#00000000";
}

}
@

So how can I do this in c++?
I have created my label as

@
QQuickText *myLabel;
myLabel = new QQuickText(its_parent);
@

Then I immagine I have to do something like

@
QTheRectanglesClass *theOutline;
theOutline = new QTheRectanglesClass(myLabel);
@

But I don't know the "QTheRectanglesClass" ...

[Katlin]

Update: I've tried using QQuickRectangle (and included the private/qquickrectangle_p.h header) but I get the error: LNK2019: unresolved external symbol "public: __cdecl QQuickRectangle::QQuickRectangle(class QQuickItem *)" (??0QQuickRectangle@@QEAA@PEAVQQuickItem@@@Z) referenced in function ..."