nova-shell/modules/Wlogout.qml

import QtQuick
import Quickshell.Io
import "." as M

M.BarIcon {
    icon: ""

    Process {
        id: proc
        command: ["wlogout"]
    }

    MouseArea {
        anchors.fill: parent
        cursorShape: Qt.PointingHandCursor
        onClicked: proc.running = true
    }
}