For a temporary solution It looks like you have to modify Pandoc's LaTeX 
template. The biblatex manual says that citestyle has to be given as 
\usepacakge option. From Pandoc's LaTeX template 
(https://github.com/jgm/pandoc-templates/blob/master/default.latex, line 
400) you'll see that the command is generated by:

```
\usepackage[$if(biblio-style)$style=$biblio-style$,$endif$$for(biblatexoptions)$$biblatexoptions$$sep$,$endfor$]{biblatex} 
```

You could insert a command to use a cite-style variable here. Save the 
default template by running `pandoc -D latex > mytpl.latex`, replace line 
400 with:

```
\usepackage[$if(cite-style)$citestyle=$cite-style$,
$if(biblio-style)$bibstyle=$biblio-style$,$endif$$else$
$if(biblio-style)$style=$biblio-style$,$endif$$endif$$for(biblatexoptions)$$biblatexoptions$$sep$,$endfor$]{biblatex} 
```

(This generates `citestyle=<cite-style>,bibstyle=<bibstyle>` if both are 
present and `sytle=<bib-style>` if the YAML doesn't define a `cite-style`.) 
You can then add `cite-style: ext-authoryear` to your YAML block and run 
Pandoc with --template mytpl.latex. You can place the template in your 
pandoc user directory so it can be used anywhere with --template 
mytpl.latex, e.g. $HOME/local/share/pandoc on Linux. See 
https://pandoc.org/MANUAL.html#option--data-dir

The downside is that you might have to redo this in further Pandoc updates 
(unless Pandoc's own template introduces a cite-style option).

Best

On Sunday, April 23, 2023 at 6:39:00 PM UTC+1 Guido Milanese wrote:

> I have been using pandoc + LaTeX + Biblatex for several years now as my 
> normal tool for scholarly writing, and I find the biblatex filter really 
> excellent. For some reasons, the style of a journal requires  a particular 
> biblatex style "mixture":
>
> ```
> citestyle=ext-authoryear, bibstyle=ext-authortitle
> ```
>
> For a similar use, see e.g. 
> https://tex.stackexchange.com/questions/433643/customizing-biblatex-authoryear-labels-in-bibliography-and-format-of-editor
> .
>
> Question: while I normally write, in my YAML header:
>
> ```
> biblio-style: <required style>
> ```
>
> I was not able to find a YAML instruction suitable for this particular 
> need, i.e. two searate style for citation and for the final bibliography. 
> Not a big issue, since I can edit the TeX file with s simple sed script, 
> but I was just curious to know if it is possible to incorporate this 
> instruction within a YAML header.
>
> Many thanks for everything.
> guido (Italy)
>

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