Showing unread emails in folders window

I can see the unread email count for the various folders that are under the main folder ([email protected]) and this is a very useful feature. Unfortunately, the count only displays for sub-folders immediately below the main folder. Many of my folders have several levels and the count does not display for the secondary and tertiary sub-levels. Can this be remedied?

Seems like it should not be too dificult since the unread count for the sub-folders currently works well. Perhaps similar coding can be appled to show the unread email count for all the subfolders?