There is also a corresponding pandoc github issue, where people also report success with ConTeXt:
https://github.com/jgm/pandoc/issues/5409#issuecomment-678782766

On Sunday, August 23, 2020 at 5:51:11 PM UTC+2 Håkon Wium Lie wrote:
Also, Prince will happily create tagged PDF from HTML.

http://www.princexml.com

(I'm on the board of YesLogic, the company behind Prince)

Håkon Wium Lie haa...@wiumlie.no www.wiumlie.no/en

Leonard Rosenthol wrote::

> That is because the current PDF creation processes from Pandoc (either via
> TeX or HTML) cannot produce a proper Tagged PDF, that is required for
> screen reader integration.
>
> Your current best bets are to produce the PDF from Word/DocX using either
> MSWord or LibreOffice, with the option to create Accessible/Tagged PDF
> turned on or to produce ICML with Pandoc and use Adobe InDesign to produce
> the Tagged PDF.
>
> I am currently producing Tagged PDFs from Markdown through both of these
> paths and they each have their own pros and cons...
>
> Future looking, Adobe is actively working with (and funding!) work in the
> TeX community produce Tagged PDFs - its a ways off, but it will happen.
>
> And Google just announced that Chrome (and one would assume CEF) can now
> produce Tagged PDFs (https://9to5google.com/2020/07/29/chrome-tagged-pdf/),
> so perhaps we'll find an HTML-based path to get there soon as well.
>
> Leonard
>
> On Sun, Aug 23, 2020 at 10:06 AM Jim <james.b...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > I'm producing a series of PDFs that are going to be read with a
> > screenreader. The screenreader lets the user skip through a document by
> > jumping to the next header. I've created documents in both Word and
> > Markdown that include headers, but when I use pandoc to convert these
> > documents to PDFs the headers are not included. The text that is defined as
> > a header has a different visual style, but it isn't a header from the point
> > of view of the screenreader.
> >
> > I am able to produce a PDF with headers if I "Save As" from word and then
> > create a PDF using Microsoft's own PDF creation tools. I'd really like to
> > use pandoc for this, though, as it would offer me a ton more flexibility.
> >
> > Is there a particular command I need to use in order for pandoc to retain
> > headers when creating a PDF?
> >
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