How to write chemical equations with mhchem in LaTeX

[MrWillCom]

mhchem is a tool for writing chemical equations, which is supported by KaTeX, but requires me to include it before using it. However, I didn't see any options to include it in configuration. What should I do to make mhchem work in my Nextra site? Thanks!

mhchem extension for KaTeX can be found here: https://github.com/KaTeX/KaTeX/tree/main/contrib/mhchem