Adding New Entries or Modifying URLs in ZIM Files

Firstly, I want to express my gratitude for your contributions to the ZIM file domain. It's a niche area and your code has significantly improved both performance and ease of use, especially since it eliminates the need to install the challenging zimlib.

I'm interested in knowing if there's a way to add a new file to a ZIM or perhaps alter an entry's URL? I noticed the example where the main page HTML can be modified, but is it possible to also change its URL? While my preference is to add a file, changing the URL could also be a solution to my problem.

I must admit, my knowledge in this area is limited, which is why my attempts to add these capabilities have been unsuccessful so far.

Thank you very much for your assistance.