How to remove or reduce the whitespace between the end of longtblr and the note created with \TblrNote?

Question

How to remove or reduce the whitespace between the end of longtblr and the note created with \TblrNote{}? This is a follow up question from the accepted answer given by @Mane32 in Footnote does not work with "longtblr":

\documentclass{article}
\usepackage{tabularray}
\begin{document}
\begin{longtblr}[
note{a} = {Hello!},
]{
      hlines,
      vlines,
      colspec   = {X[1]X[3]},
      rowhead   = 1,
      rowsep    = 0.5ex,
      width     = 0.9\linewidth,
      row{1}    = {font=\bfseries}
    }
    Header       & Second header\
    First column & Second column\TblrNote{a}\
    First column & Second column\
    First column & Second column\
    First column & Second column\
\end{longtblr}
\end{document}

Maybe, a new command needs to be defined starting from the original one in the tabularray documentation (pag.146) (but I am not able to):

\NewDocumentCommand \TblrNote { m }
 {
 \cs_if_exist:NT \hypersetup { \ExpTblrTemplate { note-border }{ default } }
 \TblrOverlap
 {
 \__tblr_hyper_link:nn {#1}
 { \textsuperscript { \sffamily \UseTblrFont { note-tag } #1 } }
 }