How to add custom QWidget to the QMenubar as action which can be toggled?

I have an Widget class as a QtPlugin. In my main application i want to load this widget and add to menubar as toggledaction, so that later if i close the widget i can open it via the Menu bar. How can this be achieved.

As this is not a docketwidget i cannot use the following:

Code:

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ui->menuPlugins->addAction(dockedWidget->toggleViewAction());

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I have tried something like this:

Code:

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void MainWindow::addToPluginsMenu(QWidget *const widget) {
    ui->menuPlugins->setEnabled(true);
    QWidgetAction *ac = new QWidgetAction(this);
    ui->menuPlugins->addAction(ac);
}

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An action is added but it is empty and cannot be toggled. Could anyone provide me a solution?

Thank you