```
% pandoc -s -f latex-latex_macros -t native
\documentclass[11pt]{article}

\newcommand{\vara}{\alpha}
\newcommand{\varb}{b}

\begin{document}
$\vara \varb$
\end{document}
^D
Pandoc
  Meta { unMeta = fromList [] }
  [ RawBlock (Format "latex") "\\newcommand{\\vara}{\\alpha}"
  , RawBlock (Format "latex") "\\newcommand{\\varb}{b}"
  , Para [ Math InlineMath "\\vara \\varb" ]
  ]
```