HasGroupedUnreadChannels
Interface that marks a ChatEvent as having grouped unread channel counts. The groupedUnreadChannels map contains per-group unread channel counts keyed by the backend-provided group identifier (e.g. {"direct": 2, "support": 5}).
The list of events which contain grouped unread channels:
message.new
notification.message_new
notification.mark_read
notification.mark_unread
notification.channel_deleted
notification.channel_truncated