Place nodes in tikz axis using csvreader

Question

I'm trying to place nodes inside a TikZ axis using csvreader command from simplecsv package. However, somehow, the following does not work:
documentclass{article}
usepackage[utf8]{inputenc}

usepackage{csvsimple}
usepackage{pgfplots}
usepackage{tikz}

title{Test}

begin{document}

begin{filecontents*}{xx.csv}
xv,yv,z
1.0,2.2,3.0
2.0,3.2,1.0
end{filecontents*}

maketitle
    
    begin{tikzpicture}
        begin{axis}[
            xmin=0,
            ymin=0,
            xmax=4,
            ymax=4,
        ]
            node at (axis cs:2, 2) {x};
            csvreader[head to column names]{xx.csv}{}{
                node at (axis cs:xv, yv) {y};
            }
        end{axis}
    end{tikzpicture}
end{document}

I always get a Argument of pgfmathfloatparse@@ has an extra }.. Does anybody spot what is going wrong here? I've been trying this for a while now..
I've put this snippet on Overleaf. Please feel free to investigate it there: https://www.overleaf.com/read/gdczbgvqmrzt

Torbjørn T. · Answer

This doesn't really answer the question as stated, but it shows how to get nodes near coords with SI. From your comment to Nico's answer this seems to be what you're after in the end. I'll just delete this if it isn't what you need, or if you feel it's not the right place for it.
documentclass{article}
usepackage{pgfplots}
usepackage{siunitx}

begin{document}

begin{filecontents*}{xx.csv}
xv,yv,z
1.0,2.2,3.0
2.0,3.2,1.0
end{filecontents*}
    
    begin{tikzpicture}
        begin{axis}[
            xmin=0,
            ymin=0,
            xmax=4,
            ymax=4,
        ]
        addplot [
            mark=none,
            draw=none,
            nodes near coords={SI{pgfplotspointmeta}{m}}
            ] 
            table[
              x=xv,
              y=yv,
              meta=z,
              col sep=comma,
              point meta=explicit symbolic
              ] {xx.csv};
            
        end{axis}
    end{tikzpicture}
end{document}

Nico · Answer

documentclass[tikz]{standalone}
usepackage{pgfplots, csvsimple, siunitx}
pgfplotsset{compat=newest}

begin{document}
begin{filecontents*}{xx.csv}
 xv,yv,z
 1.0,2.2,3.0
 2.0,3.2,1.0
end{filecontents*}
            
begin{tikzpicture}
  csvreader[head to column names]{xx.csv}{xv=x,yv=y,z=val}{
    begin{axis}[
         xmin=0,
         ymin=0,
         xmax=4,
         ymax=4
         ]
    node at (axis cs:2, 2) {x};
    node[draw] at (axis cs:x,y){SI{val}{metrepersecond}};
    end{axis}
}
end{tikzpicture}
end{document}

Place nodes in tikz axis using csvreader

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