I am trying to make an API call to get a single movies details, for example:

 https://api.themoviedb.org/3/movie/442249?api_key=[MY_KEY] 

then I noticed it did not include what the movie certification was for that one particular movie.

I read how to make a call for that information here: https://developers.themoviedb.org/3/movies/get-movie-release-dates

So I have two questions...

(1) In a single call for only the release_dates
If I was going to make an additional call to get this movies certification information, by running this:

https://api.themoviedb.org/3/movie/442249/release_dates?api_key=[MY_KEY]

Is there a way to get only the information for "iso_3166_1": "US" , without having all other language objects showing in this call by appending something to the URL?

(2) In a single call for only the movie details with appended release_dates
How would I be able to make a single API call, like this:

https://api.themoviedb.org/3/movie/442249?api_key=[MY_KEY]&append_to_response=release_dates

but have only the information for iso_3166_1: "US" appended ?