如何在 S2 和 S3 之间添加 3 个点来代替箭头？

Question

\documentclass[10pt,a4paper]{article}
\usepackage{smartdiagram}
\usetikzlibrary{shapes.geometric}
\usesmartdiagramlibrary{additions}

\begin{document}
    \smartdiagramset{uniform sequence color=true,sequence item border color=black,sequence item font size=\footnotesize, sequence item text color=white}
    \begin{center}
        \smartdiagram[flow diagram:horizontal]{$ S_{1} $, $ S_{2} $, $ S_{3} $, $ S_{4} $ }
    \end{center}
\end{document}