Thank you, it is much needed, right now the most reliable way of generating PDF's I used not so long time ago is - create DOCX with content and some template variable strings, like {{}} - unpack document and get into text, replace text - use DOCX->PDF linux tool to generate document.

Maybe this will be the good solution

See pandoc: https://pandoc.org/

And a variety of intermediate or input text formats, where you can pick your preferred poison whether for book publishing, research papers, math papers, technical documentation, slides, etc.

Including the author's own djot: https://github.com/jgm/djot

EDIT:

Sibling reply suggests latex. OK, but then you're also learning latex.