\documentclass{article}

\usepackage{markdown} 
\usepackage{biblatex-chicago}

\usepackage{filecontents}% to embed the file `myreferences.bib` in your `.tex` file

\begin{filecontents}{testref.bib}
@article{Doe,
	author = {John Doe},
	journal = {Sample Journal},
	number = {1},
	pages = {1-20},
	title = {This is a sample title of the Pandoc reference},
	volume = {14},
	year = {2022}}
	
@article{Smith,
	author = {Sally Smith},
	journal = {Journal of Something},
	number = {4},
	pages = {69-90},
	title = {The title would normally goes here},
	volume = {02},
	year = {1992}}
\end{filecontents}

\addbibresource{testref.bib}

\begin{document}

Here is a standard citation using autocite.\autocite[1]{Doe}

Here is a citation contained within a footnote.\footnote{See \autocite[6]{Smith}.}

Here is a citation contained within a footnote but without any preceding text before the citation.\footnote{\autocite[10]{Doe}. See also \autocite{Smith}.}


\end{document}