# Beamer - create subsubsection page

I know I'm not supposed to use subsubsections, but I have this hierarchical structure that I need to describe so I have to use them. I want to define a subsubsection page that looks like the picture, basically Section Title/Subsection title - Subsubsection title. I've played with the section title to generate the image. How can I achieve that result?

\documentclass{beamer}
\usetheme[sectionpage=none, progressbar=frametitle, numbering=fraction]{metropolis}
\begin{document}
\section{Section Title}
\subsection{Subsection Title - Subsubsection title}
\subsubsection{Subsubsection title}
\frame{\subsectionpage} %ideally I'd have a \subsubsectionpage command
\end{document}


\documentclass{beamer}
\usetheme[sectionpage=none, progressbar=frametitle, numbering=fraction]{metropolis}

\makeatletter
\AtBeginSubsubsection[]{%
\begin{frame}
\centering
\begin{minipage}{22em}
\raggedright
\usebeamercolor[fg]{section title}
\usebeamerfont{section title}
\usebeamertemplate*{progress bar in section page}
\par
\usebeamercolor[fg]{subsection title}%
\usebeamerfont{subsection title}%
\fi
\end{minipage}
\par
\vspace{\baselineskip}
\end{frame}
}
\makeatother

\begin{document}

\section{section title}
\subsection{subsection title}
\subsubsection{subsubsection title}

\begin{frame}
\frametitle{Title}

\end{frame}
\end{document}