Let's say a user has 250 movies in a list and they would like to temporarily view them organized by genre, or perform a basic search by genre within a list. The genre property does not exist in /3/list/{id}. The ability to perform a search within a specific or multiple lists is not supported by /3/search/movie. I would therefore have to either 1) store the genre information locally (against ToS), or 2) make 250 /3/movie/{id} API requests.

Is there a better way to do this? In this case, is it ok to store genre information locally? Is it just currently impossible to achieve this task?