I believe what you're looking for is an application badge. If this is indeed the case, then you can examine the PushPlugin
which supports badges. It also provides a method
to set the badge count visible when the app is not running.
Please note that the PushPlugin
is one of the AppBuilder
integrated plugins and you can follow the instructions outlined in the Enable and Disable the Integrated Plugins
to enable the plugin in your AppBuilder
Please give the plugin a try and let us know if we can further assist you.
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