How to add / update local notifications

Ionic Framework ionic-v3
1

As I read in the doc of ionic local notifications

If I want to add multi notifications I should use this way:

this.localNotifications.schedule([{
   id: 1,
   text: 'Multi ILocalNotification 1',
   sound: isAndroid ? 'file://sound.mp3': 'file://beep.caf',
   data: { secret:key }
  },{
   id: 2,
   title: 'Local ILocalNotification Example',
   text: 'Multi ILocalNotification 2',
   icon: 'http://example.com/icon.png'
}]);

But what about if I want to update the second local notification ?
And how can I add new local notification (without lose the old notifications) ?