As a workaround, you could use GTL with a bar/scatter overlay. The code below will produce a bar chart like you would see from SGPLOT with the labels added:
proc template;
define statgraph barlabel;
begingraph;
layout overlay;
barchartparm x=age y=height;
scatterplot x=age y=eval(height+5) / markercharacter=height;
endlayout;
endgraph;
end;
run;
proc summary data=sashelp.class noprint nway;
class age;
var height;
output out=barsum sum=;
run;
proc sgrender data=barsum template=barlabel; run;