How to write umlauts to an Qt Console App

I use on Windows the MinGW kit of Qt.

The console app uses a `qtcreator_process_stub.exe`  to bring up a console window.

I like to use

    QTextStream qout(stdout);
    qout.setCodec("utf-8");    
    qout << " Print umlaut: üöä ß" << endl;         

But the console does not Show the Umlauts correctly-

Tried Curing Qt UTF-8 console pain on Windows

but that did not work fo me.

What is necessary to show utf-8 Umlauts in a Qt console app?