What are *.json files used for and can they be statically compressed on nginx?

Question

Nginx

Hello! The server has nginx + php-fpm, CMS OpenCart + one of the modules, probably for calculating delivery, stores files in the system section, * .json format. They are large (25mb each) read the contents, there are data from the regions. I don't fully understand what they are for. Can I apply static compression to them using nginx, in the same way as it is applied to css, js, font*? And does it make sense? It seems like these files are also sent to the client from the server? In places on the Internet I met a mention of this file in an example with nginx dynamic compression ... But I'm not sure exactly. In the case of static compression, I would like to delete the sources in order to save space and traffic ...

PS I apologize for the mistakes, I wrote from the phone.

Answer 1

used for data transmission.
compression can not be used, but necessary.
only not static: these files tend to change. Or even dynamically generated.
it doesn't make sense to delete them: they don't take up that much, and it won't affect traffic at all.

Answer 2

These are Data files, it depends on the client, if the browser logs, then feel free to click. Otherwise, check with the developer, but usually all clients understand gzip