Have you tried not specifying a `biblio-style` YAML key and setting instead:

``` yaml
biblatexoptions:
- bibstyle=ext-authortitle
- citestyle=ext-authoryear
```

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}

Which means that a `biblio-style=XXX` is converted to to the option 
\usepackage[style=XXX,]{biblatex}, but arbitrary biblatexoptions are 
reproduced as is.

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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