Suppress @everyone and @here for individual channels

A server recently added a new channel that I have ZERO interest in and they use @everyone to advise when they're about to start streaming. I have both set my notifications to "never" for that channel AND muted the channel, yet I still get the red indicator and the annoying red hover text of "new mentions".

I don't want to suppress @everyone server-wide bc there are other channels in the server that I want the notification of an event happening.

An alternative option to suppressing could be a mod option on a channel-by-channel basis to turn off or remove the notification after a certain amount of time. This would be hugely useful for channels where people announce livestreams or the beginning of an event. In these situations, having a notification persist days or months later of course makes no sense.