hangul chapter, part format with new latex section templates

seclatexlab.tex

\DocumentMetadata{}
\documentclass{book}
\usepackage[hangul]{kotex}
\setmainhangulfont{Noto Serif CJK KR}[Script=Hangul, AutoFakeSlant]
\IfInstanceExistsT{heading}{chapter}
  {\EditInstance{heading}{chapter}{prefix={\KSTHE}, number-format={\thechapter~\chaptername}}
   \AddToHook{cmd/appendix/after}
     {\EditInstance{heading}{chapter}{prefix={\appendixname}, number-format={\thechapter}}}}
\IfInstanceExistsT{heading}{part}
  {\EditInstance{heading}{part}{prefix={\KSTHE}, number-format={\thepart~\partname}}}
\begin{document}
\part{테스트}
\chapter{테스트}
\section{테스트}
테스트
\subsection{테스트}
테스트
\appendix
\chapter{테스트}
\paragraph{테스트} 테스트.
\end{document}