Howto insert caption on the bottom of longtable

[sudomamartin]

Hi, please can you give me a advice, how to position caption on the bottom of long table, counting with sections?
And is it possible to use it as IfValueT, bcs I would like to defin eit as a parameter from input (it works for simple tblr.)

...
\NewTblrTheme{fancy}{
\SetTblrStyle{caption-tag}{red}
% \DefTblrTemplate{caption}{default}{} % Removes a caption
% \DefTblrTemplate{capcont}{default}{} % Removes a caption on subsequent pages
\DefTblrTemplate{contfoot}{default}{} % Removes text denoting continuation on next
}

\NewDocumentEnvironment{table_complex_long}{m o o}{%
% \begin{table}[!ht]
\centering
\fontsize{9}{11}\selectfont
\begin{longtblr}[
theme = fancy,
caption = {something},
% note{a} = {It is the first footnote.},
]{
colspec={#1},
rowhead = 1,
rowsep=4pt, % <--
hlines,
% vlines,
row{1}={bg={Stadler_b}, fg={Stadler_w}, font=\bfseries},
vline{2-10}={1}{white}
}
}{%
\end{longtblr}
% \IfValueT{#2}{Table 3.1: #2\par}
% \IfValueT{#2}{\caption{#2}}
\IfValueT{#3}{\label{#3}}
% \end{table}
}
...