Request to add chemformula package

The mhchem package is already integrated in MathJax, but I find the chemformula package more versatile and easier to use compared to mhchem.

Here is the CTAN page for chemformula: https://www.ctan.org/pkg/chemformula

Consider the following reaction:

Using mhchem, this can be typeset using:

\ce{Hg^2+ ->[I-]
$\underset{\mathrm{red}}{\ce{HgI2}}$
->[I-]
$\underset{\mathrm{red}}{\ce{[Hg^{II}I4]^2-}}$
}

Using chemformula,

\ch{Hg^2+ ->[ I- ] !(red)( HgI2 ) ->[ I- ] !(red)( [Hg^{II}I4]^2- )}

Which one is shorter and easier?

Review MathJax's existing mhchem integration and the linked CTAN chemformula documentation first. Determine the integration scope and how chemformula syntax should be supported, then define tests covering the reaction examples and expected rendered output.