Order chapters by number of unread chapters

It'll be very useful to be able order series by the number of unread chapters. Important to ignore those with 0 unread chapters in ASC sorting.

Usually I just like to quickly read series I have up-to-date, while other times, I'm looking for those with more chapters to read all at once.

It'll also helps to quickly check how many accumulated chapters are in series I left to read for later