Messaging app with VIP features

It is 2019 and I wonder why there are no messaging apps that will let me choose the people from whom I wish to receive notifications. Right now, the notifications are all or none deal and I default to none. Which is better, but not best. As people start getting detached to devices and start prioritising their offline lives, I think there would be a lot of demand for a user-centred notification system.

The closest I know is of the VIP feature in the iOS Mail app. But that’s not good enough. My dearest people will not email me; they either call or text.

I’d be very willing to open my wallet for such an app. Let me know if you know of any. Although I am sceptical that someone will build such a user-friendly app, I’d be thrilled to be proved wrong.