how to surround a column with \verb or \Verb?

[syvshc]

I tried to use cmd option, but I found that command \verb's argument isn't surrounded by {}, and I don't know how to do it.

\documentclass{article}
\usepackage{tabularray}
\usepackage{fancyvrb}
\begin{document}
\begin{tblr}{hlines,verb
    column{1} = {cmd=\Verb}}
    20 & 30 & 40 \\
    50 & 60 & 70 \\
\end{tblr}
\end{document}

it will reture an error

! Argument of \FVC@Verb has an extra }.
<inserted text>
                \par
l.14 \end
         {tblr}
? x

[lvjr]

use preto=\Verb|, appto=| instead.