pandoc -f latex -t native
\def\filename@area{foo:bar:baz}
\makeatletter
\graphicspath\expandafter{\expandafter{\filename@area}}%
\makeatother
^D
[RawBlock (Format "latex") "\\makeatletter"
,RawBlock (Format "latex") "\\makeatother"]

pandoc -f latex -t native
\makeatletter
  \newcommand\urlfootnote@[1]{\footnote{\url@{#1}}}
  \DeclareRobustCommand{\urlfootnote}{\hyper@normalise\urlfootnote@}
\makeatother
^D
[RawBlock (Format "latex") "\\makeatletter"
,RawBlock (Format "latex") "\\makeatother"]

pandoc -f latex -t native
\def\foo{bar}
\expandafter\bam\foo
^D
[RawBlock (Format "latex") "\\bambar"]