In Quarto users shouldn't specify LaTeX packages as (LaTeX commands in) header-includes. They should put them under the imagify key.
Metadata syntax: make sure users can use the same keys under imagify as under format: pdf:
Metadata coverage: make sure we pick up all documented Quarto keys that are relevant for the filter (provided we can access them when rendering to other formats than PDF)
Pass to PDF output: pass packages specified under imagify to LaTeX when targeting LaTeX or PDF. In Pandoc, generate raw header-includes. In Quarto, use quarto.doc.include_text('in-header', text) and quarto.doc.use_latex_package(pkg, opt). See Quarto Lua API.
In Quarto users shouldn't specify LaTeX packages as (LaTeX commands in)
header-includes. They should put them under theimagifykey.format: pdf:imagifyto LaTeX when targeting LaTeX or PDF. In Pandoc, generate raw header-includes. In Quarto, usequarto.doc.include_text('in-header', text)andquarto.doc.use_latex_package(pkg, opt). See Quarto Lua API.