To me, Typst is the 'weirdly missing' option here. I really see it as the most promising successor to LaTeX, which is not something I say lightly given that I spent years scoffing at the idea of Typst ever displacing LaTeX in my life.
In less than an hour I reproduced my résumé—complete with fancy functions to typeset employment entries on a grid system. In under 24 hours I was tinkering with the Typst source code.
Typst is amazing. Syntax is clean and consistent. The compiler is so so fast. Docs are excellent. And it is very close to TeX when it comes to typesetting quality. There are a few tiny rough edges that any \usepackage{microtype} enjoyer will miss, but stuff is improving rapidly.
(Also, XKCD disclaimer: this was not an LLM—I just use em-dashes a lot because TeX made them easy to type and I got used to having them.)
In the exact same way that git is: it isn’t, but one easy way to use it is.
The language, ecosystem, and compiler are FOSS. There is a cloud editor / collaboration platform that is paid, but nothing about the language requires that you use it (I use it almost exclusively through emacs)