Count on unread for all sub-folders?

Count on unread for all sub-folders?

I have a medium-complexity hierarchy of folders into which I move email messages. The Zoho mail web interface shows a count of unread messages in each folder but it does not cascade that count upward to parent folders. So, when I look at all my top level folders I see no indication that there are unread within them. All I see if a count labeled Unread that mixes all folders into one. Is there a way for each parent folder to show how many unread there are within it and all chil folders under it? This would be most valuable!