I'd recommend using a "new style" writer and just replacing the code that formats tables.

https://pandoc.org/custom-writers.html#new-style



> On Nov 14, 2022, at 7:30 PM, bapt a <augu...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> Hi,
>
> I'm hoping to play around with custom writers, to understand a bit better how to turn pandoc's AST into a specific output format (for example, I'd like to use tabularray syntax for tables in LaTeX, and it seems "cleaner" to use a writer than to inject raw inline LaTeX via a filter into the AST). The html writer example is quite useful, but since I'm aiming for LaTeX output, it would be helpful to have something a little closer in syntax as a starting point.
>
> I searched a bit and the closest thing I could find was a plain TeX writer at https://github.com/drehak/pandoc-to-markdown
> but this is perhaps not as helpful for learning because most of the magic seems to be delegated to custom TeX macros. (A good strategy, but I wouldn't know (La)TeX well enough to perform some of the more complex processing)
>
> I wonder if someone here has a minimal (or complete!) example of a custom Lua writer for LaTeX they could share?
>
> Many thanks,
>
> baptiste
>
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