Grant or Denie access with role combination

I was very suprised when I tried to set permissions on a specific channel to realize that it's not possible to grant or denie a channel with more than one role.

Exemple : I want to grant access on channel 1 only if members have role A and role B, if they have only A or only B I don't want them to access the channel.

It's actually not possible then it seem pretty useful and not a very major fonctionnality to create.

I hope it could be done one day, i'm sure there is a lot of people that whould enjoy that.

Thanks all your work, even if I miss that specific fonctionnality, I like discord very much :)