How to make pandoc generate header using beamer structure instead of blocks

How do I change the way headers below slide level are converted in LaTeX by pandoc from {block} environment to \structure{} command?

Imagine such a Markdown file (foo.md)

# Slide title

## Header

Lorem ipsum dolor sit amet, consectetuer adipiscing elit.

Let us convert it to LaTeX with the following command:
```
pandoc -t beamer --slide-level 1 foo.md -o foo.tex
```

The resulting LaTeX file is something similar to:

\begin{frame}{Slide}

\begin{block}{Header}

Lorem ipsum dolor sit amet, consectetuer adipiscing elit.

\end{block}

\end{frame}

Is there an easy simple and elegant solution so that pandoc produce something like the following?

\begin{frame}{Slide}

\structure{Header}

Lorem ipsum dolor sit amet, consectetuer adipiscing elit.

\end{frame}

Solution

Easy to achieve via Lua filters:

function Header (header)
  if header.level == 2 then
    local inlines = pandoc.List:new{}
    inlines:extend {pandoc.RawInline('tex', '\\structure{')}
    inlines:extend(header.content)
    inlines:extend {pandoc.RawInline('tex', '}')}
    return pandoc.Plain(inlines)
  end
end

Safe the filter to a file and pass that file to pandoc via the --lua-filter option.