Yes, it is possible, you just need a web server like
Apache or
Nginx which will host the JMeter Plugins Repository Descriptor file.
As of today the descriptor looks as the attached repo.json file
But if you open the file you will see that it can go to the Internet for downloading plugin .jar files and their
dependencies so you need to amend the URLs and point them to your local versions of the libraries instead of
Maven Central,
Github, etc. . For example J
Frog Artifactory is a good candidate, or you can ask around, it might be the case your company already has some local mirror.