XdgDecorationManagerV1 documentation needs clarification

link : https://doc.qt.io/qt-6/qml-qtwayland-compositor-xdgshell-xdgdecorationmanagerv1.html

XdgDecorationmanagerV1 has a property preferredMode, which indicates the server's preference on whether the window decoration should be done on sever side or client side.

The unclear part is how it should be handled at the client side; does Qt provide some QML type to catch the server's preference? or Should the client implement some logic in C++ using wayland library to get the server's preference?
In order for the user to practicallly make use of this QML type, that information should be included in the documentation.