Static json files are block by blacklist

I am try to study the theme development, and do ghost install local. It works fine.

My problem is that I am using a 3rd party library which need to download a static json file from the host. After searching the forum, I know json file was blocked by blacklist during build time for security reason.

Install nginx may solve this problem, but I want to know is there is a easy way to combine the ghost content with some other local folder so that I can use php -S to serve the static files on the same port of server?