\documentclass{scrbook}
\usepackage{luatexja}
\usepackage{tabularray}
\usepackage{fontspec}
%  \usepackage{luatexja-fontspec}
  \usepackage[
    mode=text,
    detect-all,
]{siunitx}
  %\usepackage{luatexja-fontspec}
\makeatletter
%\typeout{\meaning\@begindocumenthook}
\usepackage{collcell}
\newcolumntype{s}{>{\collectcell\si}c<{\endcollectcell}}
\DeclareSIUnit\angstrom{Å}
\UseTblrLibrary{siunitx}
\begin{document}
  \ifdefined\gtfamily\gtfamily\fi Ω
  {\ExplSyntaxOn\makeatletter
   \ttfamily\meaning\@begindocumenthook}
  
  \SI{-2.5e-10}{mol.L^{-1}}\SI{1}{\micro\metre\angstrom\arcminute\arcsecond\ohm}
\vrule\SI{}{\ohm}\vrule

\vrule
\begin{tabular}{S}
    0 \\   12345 \\   e3 \\   0.0+-0.1
  \end{tabular}
\vrule

 \vrule$\begin{array}{Ss}
%   \typeout{\meaning\@preamble}
   -.123 & J.mol^{-1} \\
   1.23e-3 & Hartree \\
  \end{array}$

 \vrule\begin{tabular}{Ssl}
  -.123 & J.mol^{-1} &「\\
  1.23e-3 & Hartree & あ\\
\end{tabular}

\begin{tabular}{@{}llr@{}}
  hogehoge&hogehoge&hogehoge\\
  \multicolumn{2}{c}{\tablenum{1.246e-3}}&hoge\\
  \multicolumn{2}{c}{\tablenum{-.362}}&hoge\\
\end{tabular}

\end{document}
X\vrule\begin{tblr}{Ssl}
  -.123 & J.mol^{-1} &「\\
  1.23e-3 & Hartree & あ\\
\end{tblr}


\end{document}
