In Boxplot, Boxmean=StyleParam.BoxMean.SD does seem to show mean & Standard deviation

[MaheshPunna]

let y=[2.37; 2.16; 4.82; 1.73; 1.04; 0.23; 1.32; 2.91; 0.11; 4.51; 0.51; 3.75; 1.35; 2.98; 4.50; 0.18; 4.66; 1.30; 2.06; 1.19]

[
Chart.BoxPlot(y=y,Boxpoints=StyleParam.Boxpoints.All,Jitter=0.5,Notched=true,Marker=Marker.init(Color="red"),Boxmean=StyleParam.BoxMean.True,Name="Only Mean");
Chart.BoxPlot(y=y,Boxpoints=StyleParam.Boxpoints.All,Jitter=0.5,Notched=true,Marker=Marker.init(Color="blue"),Boxmean=StyleParam.BoxMean.SD,Name="Mean & SD")]
|> Chart.Combine

The expected figure is: