Notifications from another service without ejecting

Is it possible to use a Notification service like Google or Amazon SNS directly in stead of using Expo to send the Notifications without ejecting?

Can this be done using: Notifications.getDevicePushTokenAsync(config) ?

Is there an example available for this somewhere?

Over here I read that someone was able to make it sort of work: Expo Push Notifications at Amazon SNS

Is this still working?