Displaying a running timer in the notification bar when app goes to the background mode

I have used the following plugin to run the app in the background.
Background plugin from katzer

I have to run a timer in the notification bar continuously when the app goes in the background (just to show how long the app is in the background).

title : ‘Timer running’,
text : ‘some text’

cordova.plugins.backgroundMode.onactivate = function () {
setInterval(function () {
text: a
}, 1000);

I have initialized a to 0 when the app is launched. The code is working and the text part of the notification is getting updated.
But each time it is updated a new notification is created. Is there a possible way to update just the text part of the notification without creating a new notification each time?

Thanks in advance