chemical equation coding

[davidpassmore]

Description

I am coding a chemical equation. I have
$CH_4$ + 2$H_2O$ $CO_2 + 4H_2$
I want to put a rightleftharpoon between $CH_4$ + 2$H_2O$ and $CO_2 + 4H_2
I saw this is coded as /rightleftharpoon in Latex, but I am not sure how to enter it.
Trying to do something like this:

[mcanouil]

Please provide actual actionable Quarto code.
Anyhow, I suggest, depending on the tool/format being used to look at Mathjax, KaTeX, etc. (html) or LaTeX documentation.

Note that this discussion board is about Quarto not about how to write LaTeX-like equations. There are way better places out there for this kind of questions.

EDIT: here is the documentation to insert equations in Quarto: https://quarto.org/docs/authoring/markdown-basics.html#equations