Is it possible to save PDF/A file with Chrome headless? If not, is there any library that allows this in node?
Or maybe it is possible to say "I'm generating" PDF/A file with some considerations, like embedding fonts or no dynamic content?
No Chrome headless does not have way to save PDF/A. However you can use a PDF to PDF/A conversion tool to get the job done (there is a free online tool from https://www.pdftron.com/pdf-tools/pdfa-converter)