This bot is what I was waiting for. I've used SteemWatch but it didn't work well on mobile (Steemit.Chat via Rocket.Chat).

I'm glad that it will be open source.Discord notifications works well, and for me, Busy integration is a great bonus, so I won't just use @ginabot to see my notifications, but for interaction when I feel necessary. It's more comfortable than always rewriting the URL.