If you're on macOS or Linux you can use the shell to concatenate the files 
before feeding them to pandoc:

    pandoc -t latex format.yaml input.md

Alternatively, you can use:

    pandoc --metadata-file format.yaml -t latex input.md

On Friday, August 30, 2019 at 6:50:22 AM UTC+2, Oliver Baumann wrote:
>
> I write my Markdown files with a YAML header consisting only of metadata 
> fields relating to the *content*, like title, author, etc.
>
> In another file format.yaml I have the YAML metadata applying to the 
> *formatting*, like documentclass, font- or papersize.
>
> How can I inject format.yaml into pandoc, so that it is used when I 
> convert my source to LaTeX? I'm looking for something like 
> --include-in-header, but for YAML and injected before the template is 
> set-up.
>
> Many thanks for any pointers!
>
>
>

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