\documentclass[polutonikogreek,ngerman]{libertinedoku}
\begin{document}
\pageTitle{Fonttabellen\\[1em] LGR}
\newcommand\printFDFont[1]{\InputIfFileExists{#1.inc}{}{}}
\let\myfdentry=\PrintTableFontShape%
%\fonttab{LGR}{lmr}{m}{n}
\input{loadFDlgr}
\end{document}