mhchem support

LLMs (particularly Gemini models) often use the mhchem package for mathjax when writing chemistry equations (

https://mhchem.github.io/MathJax-mhchem/).

It would be great if you t3chat could support such messages, as currently it does not render very well, e.g.

For reference, this is what that message was meant to look like (written in Obsidian)