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Yeach, you're right, all of packages are hard code in backend, you can found it here: https://github.com/zhyd1997/Eorg-Server/blob/209a142c687a566...

Also, you can download the source code and compile it by your local machine, which can add any packages you need.

That's like 1/10 of my usual list of packages :) . (My coworkers complain a lot about my overuse of packages.) What about amsmath/amssym/amswhatever?

You can clone the project from github and customized it as you like for your personal working.