That's possible, although one might confuse it with the notification indicator. What about this:
 (2) Topic - board
Code: Select all
[replies] (notifications) topic title - board name
Well than, by all means checkout and test the latest version from Github
view=unread#unreadparameter in the URL. It might be that when you have visited the topic in another tab/window/device, the posts are already marked as read.