I was wondering if your theme has any notification menu like this: https://we.tl/t-6eU7PXQ0T4 or the one on facebook (many website have this notification menu)? For example, to display post since last user log in, a custom message, or other type of notifications..
Meteorite doesn’t provide such functionality, furthermore this would be plugin territory I guess.
After some research I couldn’t find a plugin that creates a notification menu like that. You may want to do a deeper search or hire a developer on codeable or upwork if you need such a feature on your website.