Ping people per Voice Channel

One thing I found somewhat annoying, is whenever I have to go AFK whilst in a voice chat, and I'm unable to verbally say I'm afk (broken mic, loud environment, etc.), I have to either just say in text chat and *hope* that they all read it, or I have to @tag them one by one.

Now, that's not so bad when dealing with small groups of 2-5 people, but when playing something like WoW in a raid, you have maybe  10-40 people, you're better off just pinging one person and asking them to tell everyone. But I feel like giving the ability to ping a whole voice channel would be great.

Again, take the example of a raid. You need to alert the entire raid group of something, and the voice chat is active, so you may go unheard (and it's not something you want to interrupt by using priority speaker or anything like that), and it's also not super time sensitive. 
Just the ability to mention everyone within a single voice channel would be invaluable.