2. `minted` supports a `mathescape` option to render math content
    inside code. `fvextra` supports the same option, but maths
    characters are escaped by engrave-faces-latex-face-mapper.

I’l also take a look at this :)

Implemented in engrave-faces-latex, but not worked into ox-html yet. If you
could check it out on the engrave-faces-latex side and check it’s behaving
sanely, that would be helpful.

I've tried it, and mathescape works, thanks !

-- 
Sébastien Miquel