Push notification if friend enters channel on common server

Hey! Am I allowed to suggest a new feature idea? My friends are used to talk using discord. But we are missing one very useful feature. If there would be a mobile push notification, every time a friend enters our channel on our server, it would be a lot easier to meet. At the moment we have to send a message to everyone using other messengers, such a feature would make this useless. Maybe a subscription feature for special channels would be a good solution. Thanks for reading, Felix & friends