Add an "icon notification" for a progressive web application (PWA)

Question

I am developing a progressive web application (PWA) that will ultimately send notifications to users.

I already know that I can send push notifications (for example, in any regular application), as described in the following blog post: https://developers.google.com/web/fundamentals/getting-started/codelabs/push-notifications /? hl = en-us .

However, after the application appears on the main screen, I would like to add a “hint” to the user, telling him that he should get access to the application. A great way to do this is to do something like "icon notification" (as shown in the whatsapp icon in the image below).

Whatsapp icon badge notification

Is it possible to add this type of behavior using progressive web applications?