[Standards] XEP proposal: filtering chat notifications

I am an end-user using two XMPP clients: for desktop and mobile. Since there is no XEP standard for muting conversations, the two clients implement this in their own way, and they are out of sync: the contacts I have muted on phone are not automatically muted on desktop and vice-verse. While looking to see if XMPP have such XEP, I found these extensions from Tigase that might be helpful in writing an official XEP: https://xeps.tigase.net/docs/push-notifications/filters