Thank you for suggestions. Unfortunately, it does not work. More specifically, the superscript 6 as in your example works but subscript n (Unicode 2099) does not. I am including the code.
data _anno;
length label $ 200;
drawspace="layoutpercent"; function="text"; textweight="normal"; textsize=12;textcolor="black"; width=200;
x1=50; y1=2.5;label="XXXXX(*ESC*){unicode '2099'x}"; output;
x1=2.5; y1=50;rotate=90;label="YYYY(*ESC*){sub '6'}"; output;
run;
proc sgplot data=sashelp.class sganno=_anno noautolegend ;
scatter x=weight y=height/group=sex datalabel=name;
xaxis label=' ';
yaxis label=' ';
run;
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