LaTeX syntax is supported on every text field that uses Remarkup, the Phabricator markup language.
Usage syntax:
```
katex {{{
\begin{bmatrix}
a & b \\
c & a
\end{bmatrix}
}}}
```
We're using katex to render LaTeX to HTML: [[https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX | Katex function support documentation]]