dev-texlive/
texlive-mathscience

TeXLive Mathematics, natural sciences, computer science packages

https://www.tug.org/texlive/

There are no pull requests

You think something is missing here?
Start with filling a new pull requests.

If you also like to help the Gentoo project, you can consider sending a Pull Request via GitHub.
Before doing so, you might want to take a look at the wiki page.