Directly access/edit tvdb file of a TV Library (TV app) on Mac

I'd like to change the date added field on a home movie in the TV app on macOS. This will help organisation, to lay them out in correct chronological order. This field cannot be updated in the app (via get info - the field value is displayed but is not editable). Is there any practical way to do this? I tried 'show package contents' of the TV library itself, but don't know what format the data is stored in or how to edit it (opening it in text edit doesn't show anything meaningful - the data is encoded in something that's not plain text). Wondering if it's an SQLite database or something similar. (I tried opening the tvdb file inside the package with sqlite3 but it says not a database).