Be able to specify if a vertical Drawer is placed over the header/footer or under/over it

import QtQuick 2.5
import QtQuick.Layouts 1.1
import QtQuick.Controls 2.0

ApplicationWindow {
    id: window
    visible: true
    width: 640
    height: 480

    header: ToolBar {
        RowLayout {
            ToolButton {
                text: "Test"
            }
            ToolButton {
                text: "Test"
            }
            ToolButton {
                text: "Test"
            }
            ToolButton {
                text: "Test"
            }
        }
    }

    Drawer {
        width: window.width
        height: 200
        edge: Qt.TopEdge
    }
}