How can I use biblatex commands in a Markdown file (instead of Markdown's native cite commands) and have pandoc output a .tex file that preserves those biblatex commands unchanged?

question disambiguation

My question is distinct from one that may sound similar, where the issue was how to use Markdown's native citation format (e.g., [@mycitation, 23]) and have pandoc produce .tex output that converted those to biblatex commands (e.g., autocite[23]mycitation).

Also, to be clear, I am not asking how to have pandoc format the citations for me. In other words, I believe that the answer to my question should not involve pandoc-citeproc.

motivation

I would like to be able to write in Markdown but take advantage of the range and flexibility of biblatex-chicago cite commands, which are far more flexible than Markdown (which, for example, does not have a way to reproduce volcite...[...]... natively -- that is, without doing it manually as in @mycitation, vol. 1, p. 23). I would then like to convert those Markdown files to LaTeX that can be processed with xelatex and biber.

MWE

Markdown input:

This assertion *must* be cited.^[See volcite1[23]mycitation.]

Output using pandoc myfile.md -o myfile.tex (note the escaped curly braces and square brackets):

This assertion emphmust be cited.footnoteSee
 volcite1[23]mycitation.

Desired .tex output:

This assertion emphmust be cited.footnoteSee volcite1[23]mycitation.

No need to use Pandoc, you can use the Markdown package:

documentclassarticle
usepackagebiblatex
usepackage[hybrid,inlineFootnotes]markdown
begindocument
beginmarkdown
This assertion *must* be cited.^[See volcite1[23]mycitation.]
endmarkdown
enddocument

The hybrid package option enables the TeX commands, inlineFootnotes add support for the footnotes. It supports many of the Pandoc extensions, see the manual.

This is the result:

It is also supported by tex4ht, so you can convert your Markdown + LaTeX document to HTML:

make4ht -us filename.tex "fn-in"