Currently we can only use User, Account, Global Context, and Device rules in the audience for a knowledge center bot. As we are looking at localizing our content for global markets this is a bit deal. We need to be able to target users based upon their Account Location (country).
Simply using the User Language field is not adequate because you may have a user with their language set to en-US even though their account was sold in our Northern Europe market, so they should get the KBOT for Northern Europe (defined by countries) and not the North American KBOT.
cc: