the metafun format of metapost can not be used in miktex

[u-fischer]

The following document fails in miktex with the error message

(luamplib)               ! I can't open file `metafun.mp'.

% Run with lualatex
\documentclass{article}
\usepackage{luamplib}
\begin{document}

\mplibsetformat{metafun}
\begin{mplibcode}
beginfig(1);
drawarrow (0,0)--(10,10);
endfig;
\end{mplibcode}

\end{document}

The missing file (and the other needed by this format) are in texlive in \texmf-dist\metapost\context . Would it be possible to get them in miktex too? There is no need to build some format, simply the existence of the files is enough to get the example working.