Getting root object from c++

[codeman]

Hello freinds,

I have a question. Say I have this

....
Rectangle{
id::root
property string mystring:""
 
MyPlugin{
 
Component.onCompleted: {
            setString("Hello");
        }
}
 
}

....
Rectangle{
id::root
property string mystring:""

MyPlugin{

Component.onCompleted: {
            setString("Hello");
        }
}

}

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How can i access my string mystring from my plugins method say componentComplete(), which is an implementation from QQmlParserStatus, or from Q_INVOKABLE MyPlugin::setString Q_INVOKABLE ???