Many people, including me, use Pandoc. The markup is simpler (extended Markdown), but, more importantly, you can compile it to a variety of other markups, so it

Many people, including me, use Pandoc. The markup is simpler (extended Markdown), but, more importantly, you can compile it to a variety of other markups, so it lets you repurpose your documents. And if you need more detailed control than Pandoc allows, you can embed raw LaTeX (or html). You can also extend Pandoc by writing your own “filters,”¹ which means you can sort of create your own markup language. Is something like that what you had in mind? ¹https://lee-phillips.org/panflute-gnuplot/ https://lee-phillips.org/panflute-gnuplot/