Hosting a json file with custom url

I am currently using the web version of www.remarpro.com and I need to upload a json file to my website with this specified url https://my-domain/.well-known/did.json. The reason being is that the json file contains some sort of authentication information. But the current url of the json file is https://my-domain/wp-content/uploads/did.json. What can I do to change that? Thank you!