Lists: Add a TV series' season to my Check-Ins list

I want to keep track of when I watched the seasons of TV series. Right now I would have to check in all the episodes which would crowd my list way too much. Or I'd maybe check in only the first/last episode of each season. But then I would not be able to easily spot which season it belongs to from merely reviewing the list.
So it would be cool if I were able to add a single entry to my CheckIns like " Season ".