Is there a way to reduce time complexity on the frontend with using Drupal json-api includes?

Question

I'm currently working with an output from the Drupal json-api module and have noticed that the structure of an output forces an O(n^2) time complexity issue on the front by forcing the front end developers to reformat the json output given to them so an attachment can me in the same object as the entity it belongs to.

Example

So let's say I'm listing a bunch of categories with their thumbnails to be used on the front end. What a json output would normally look like for that is something like:

Normal category json structure

[
   {
      "uid":123,
      "category_name":"cars",
      "slug":"cars",
      "thumbnail":"example.com/cars.jpg"
   },
   {
      "uid":124,
      "category_name":"sports",
      "slug":"sports",
      "thumbnail":"example.com/sports.jpg"
   }
]

With drupal it seems that thumbnails are in their own includes separate from data creating an O(n^2). For example:

I make a get request using this endpoint:

example.com/jsonapi/taxonomy_term/genre?fields[taxonomy_term--genre]=name,path,field_genre_image,vid&include=field_genre_image

The structure of the data returned from the drupal json api module is going to be similar to this:

pseudo code for better readability

{
   "data":[
      {
         "uid":123,
         "category_name":"cars",
         "slug":"cars",
         "relationships":{
            "thumbnail":{
               "id":123
            }
         }
      },
      {
         "uid":124,
         "category_name":"sports",
         "slug":"sports",
         "relationships":{
            "thumbnail":{
               "id":124
            }
         }
      }
   ],
   "included":[
      {
         "type":"file",
         "id":123,
         "path":"example.com/cars.jpg"
      },
      {
         "type":"file",
         "id":124,
         "path":"example.com/sports.jpg"
      }
   ]
}

The problem with the drupal output is that I have to loop through the data and then in the data loop loop through the includes and attach each thumbnail to the category causing an O(n^2) on the frontend.

Is there a way for the frontend to request a category using the drupal json module to contain the thumbnail in the category like the normal json output above without having to restructure the json api on the frontend?

Please note I am not a drupal developer so the terminology I might use will be off.