Push Notifications: how to do it? Amethyst doesn't have a server, so there nothing to push from.

Is it possible to sign up from push notifications from independent relays? Is it safe? 🤔

FYI: a push notification is simply an alert to the app that some new content is available. The push doesn't actually carry the content itself. Upon receiving, Android wakes the app up and the app needs to ping relays to download the new content and display as a notification.