As I said several times on this page, a field on the vehicle page to add the info is not a good idea (and it will not be easier to fill it there than putting it in the comments).
As I also said, only possibility is that the list of episode titles is stored somewhere and the site fetches the info on the basis of the episode number. I may add that, but since there are lots of things that I have to add too I can't say when I will add it.