pandoc-crossref-0.3.18.0: test/m2m/subfigures-grid/expect.tex
You can define subfigures:
\begin{pandoccrossrefsubfigures}
\subfloat[1]{\includegraphics[width=0.3\linewidth,height=\textheight,keepaspectratio]{fig1.png}\label{fig:subfig1}}
\subfloat[2]{\includegraphics[width=0.3\linewidth,height=\textheight,keepaspectratio]{fig2.png}\label{fig:subfig2}}
\subfloat[3]{\includegraphics[width=0.3\linewidth,height=\textheight,keepaspectratio]{fig3.png}}
\subfloat[4]{\includegraphics[width=0.3\linewidth,height=\textheight,keepaspectratio]{fig4.png}\label{fig:subfig4}}
\subfloat[5]{\includegraphics[width=0.3\linewidth,height=\textheight,keepaspectratio]{fig5.png}}
\subfloat[6]{\includegraphics[width=0.3\linewidth,height=\textheight,keepaspectratio]{fig6.png}\label{fig:subfig6}}
\subfloat[7]{\includegraphics[width=0.3\linewidth,height=\textheight,keepaspectratio]{fig7.png}\label{fig:subfig7}}
\subfloat[8]{\includegraphics[width=0.3\linewidth,height=\textheight,keepaspectratio]{fig8.png}}
\subfloat[9]{\includegraphics[width=0.3\linewidth,height=\textheight,keepaspectratio]{fig9.png}\label{fig:subfig9}}
\caption[{Caption}]{Caption}
\label{fig:subfigures}
\end{pandoccrossrefsubfigures}
\begin{pandoccrossrefsubfigures}
\subfloat[1]{\pandocbounded{\includegraphics[keepaspectratio]{fig1.png}}\label{fig:subfig21}}
\subfloat[2]{\pandocbounded{\includegraphics[keepaspectratio]{fig2.png}}\label{fig:subfig22}}
\subfloat[3]{\pandocbounded{\includegraphics[keepaspectratio]{fig3.png}}}
\subfloat[4]{\pandocbounded{\includegraphics[keepaspectratio]{fig4.png}}\label{fig:subfig24}}
\subfloat[5]{\pandocbounded{\includegraphics[keepaspectratio]{fig5.png}}}
\subfloat[6]{\pandocbounded{\includegraphics[keepaspectratio]{fig6.png}}\label{fig:subfig26}}
\subfloat[7]{\pandocbounded{\includegraphics[keepaspectratio]{fig7.png}}\label{fig:subfig27}}
\subfloat[8]{\pandocbounded{\includegraphics[keepaspectratio]{fig8.png}}}
\subfloat[9]{\pandocbounded{\includegraphics[keepaspectratio]{fig9.png}}\label{fig:subfig29}}
\caption[{Caption}]{Caption}
\label{fig:subfigures2}
\end{pandoccrossrefsubfigures}
Figures themselves can be referenced fig.~\ref{fig:subfigures2}, as well
as individual subfigures:
figs.~\ref{fig:subfig1}, \ref{fig:subfig2}, \ref{fig:subfig29}