The number of all emails in folder

The count of new emails works fine and also the count of star emails. By design K-9 shows only these 2 on a menu panel.

But I’d like to have on menu panel where those 2 shown also the number of all emails in the folder.

Google Mail does it. It shows the number of emails in any folder like in Inbox, Sent and so on. Why not K-9?

Thanks.

P.S. It is just a small thing but otherwise the app is great.