Is this happening often enough to require a column? I'm not sure the intention would be for movies to go 4K and then regularly remove the option. If this has happened on numerous movies though, I would definitely consider it.
I have also added some 'filtered views' on the sheet, if you click on the Data menu or the filter icon on the toolbar, you now have some options for filtering on different video/audio qualities and there is also a sort by date added to see when movies were last added to the list. you can also manually filter using the filter buttons at the top if you like though. These just give some predefined options.
I'll try to keep this list updated, and will also update it based on comments here. When I finish making it, I wouldn't mind if any of long term members are interested in becoming co-editors too.
I'm still trying to figure out how cheap charts is doing it automatically using the search api, but I have a feeling they use the EPF feed from Apple which you have to apply to get. That might also explaing why there are movies missing from their list as the EPF feed requires manual downloads and updates.