I am not sure if this would help, but we use `${USERDATA}` e.g.

```yaml
css:
- "${USERDATA}/epub-css.css"

epub-fonts: 
- "${USERDATA}/fonts/fontname-*.ttf"
```
This is the root of your folder with the `defaults` folder/ `defaults.yaml` 
file in it.

We then call Pandoc with `--data-dir` argument if it is not the default 
location and of course your desired defaults file with `--defaults=xxxx`
On Sunday, 22 May 2022 at 21:15:46 UTC+1 BP wrote:

>
>
> Den sön 22 maj 2022 18:28John MacFarlane <j...-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> skrev:
>
>>
>> I'm pretty sure that the expansion doesn't work for 'defaults:',
>> but I can't now recall whether there was a reason for that.
>> Maybe submit a bug report?
>>
>
> I will, because this breaks my workflow where I use the same top level 
> defaults file on different machines.
>
>
>
>
>> BPJ <mel...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>>
>> > I forgot to mention the vital points that `${HOME}...` works with `css: 
>> []`
>> > in the same file and that everything works if I use an absolute path in 
>> the
>> > `defaults: []` entry.
>> >
>> > Den lör 21 maj 2022 20:45BPJ <mel...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:
>> >
>> >> In a defaults file in the current directory I have the lines:
>> >>
>> >> ``````yaml
>> >> defaults:
>> >>   - ${HOME}/style/ling-html2pdf.yaml
>> >> ``````
>> >>
>> >> I'm sure that file exists but pandoc complains and says it doesn't. 
>> Might
>> >> Pandoc's idea of what `${HOME}` expands to differ from the shell's 
>> idea of
>> >> what `$HOME` expands to?
>> >>
>> >>
>> >>
>> >
>> > -- 
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>> .
>>
>

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