Use shared file url for body of postman post - i.e. retrieve web hosted file and post

Our firm distributes sample data to our app. This is done via web hosting. Every client has an {{url}} parameter they fill in and all clients have the same structure to locate the sample data {{url}}/sample-data/file/load.json. We update this load.json about 1 X a week. Instead of having clients go to the site, download the file - add the contents to a post body - we’d love the ability to define in postman the location of the file. Clients already set their environment variable for the {{url}} - this would allow us to write posts for them as part of a collection that they could run with collection runner to initiate / repair their sample data. This would create an end-to-end process.