How should I approach a pop up with a message or sound in a widget (even when closed) .

Hello All, 

Task to accomplish : I am trying to write a widget with a glance view for a Fenix 6 watch(as a hobby). To enable or disable the widget, the menu can be accessed by the glance in the simulator. Once enabled in the menu I would like the app to send a pop message or just sound at a predefined interval even if the widget is closed. 

My Research : I have looked at the Attention, background and ServiceDelegate module but I'm unable to set something that can run in background and alert at an interval. 

Question: On enabling the widget in menu (AppMenuDelegate,mc), If I register for a temporal event with registerForTemporalEvent method for an interval, how do I tell it to send a pop up message or make a sound with Attention module, even if we have closed the widget menu after enabling the widget.

var toggleItem = item as WatchUi.ToggleMenuItem;
            
if (toggleItem.isEnabled() == true){
            
    Storage.setValue("appState", "Enabled");
    var everyTenMins = new Time.Duration(5 * 60);
    Background.registerForTemporalEvent(everyTenMins); 
    // how do i get a pop up message/alert/sound?            
}

Any guidance is appreciated. 

Thanks