Rendering R package vignette with centralized CSS

Hi Christophe, @cderv
Thank you for all your work on the quarto-r package and beyond.
I was wondering if there is a way to use CSS styling files dynamically rather than statically to reduce duplication.
This would be especially useful on the Bioconductor Build System where it has access to the appropriate BiocStyle files.
Essentially, we would like to use a "standardized" styling file:

---
title: "Example R Package"
author:
- name: Marcel Ramos
date: last-modified
format:
  html:
    toc: true
    toc-location: left
    number-sections: true
    embed-resources: true
    mainfont: "Atkinson Hyperlegible"
    link-external-newwindow: true
    css: "`r system.file('resources', 'html', 'biocstyle.css', package = 'BiocStyle')`"
vignette: >
  %\VignetteIndexEntry{Example Overview}
  %\VignetteEngine{quarto::format}
  %\VignetteEncoding{UTF-8}
---

Thank you!

Start with the R package vignette example in the issue and investigate how quarto-r handles the CSS value in the HTML format configuration. Determine whether a dynamically evaluated system.file path can be supported for centralized BiocStyle files, and document the supported outcome or limitation.