I have a bunch of imdb film ids and I want to get the certification (G, PG etc.) for them

current I call to:

https://api.themoviedb.org/3/find/tt0137523?api_key=###&external_source=imdb_id

to get the movieDB id, then

https://api.themoviedb.org/3/movie/themovieDBid/release_dates?api_key=###

but I'd like to be able to do that in one call if possible, something like:

https://api.themoviedb.org/3/find/tt0137523?api_key=###&external_source=imdb_id&append_to_response=release_dates

this adds a top level (empty) release dates element so doesn't quite work as hoped. Is there a way to go from imdbID -> certification info in a single call?

edit: changed 'classification' to 'certification'