Is it possible to add significance letters or stars to a sgplot vbar?

[Dillonk499]

Hi, 

I am running the below code to generate a bar chart showing the difference between weights of people in two trials at various timepoints. 

proc sgplot data=Stomach_performance noborder;/* Create a graph from the weather.2 data, removing the legend and chart borders */
	  	title1 c=white  bcolor=black height=10pt ' Performance data';/* Set title name and settings */
		title2 c=white  bcolor=navy height=10pt 'Start/End Weights';/* Set title name and settings */
		styleattrs datacolors=(darkgreen white);
	  	vbar Time / response= weight  stat=mean group=Trial groupdisplay=Cluster /* Set the graph to be a vertical bar plot and specify that the groups are clustered by gender */
	  	dataskin=MATTE filltype=SOLID  limitstat=stderr; /* Apply seetings to apperance of the bar plot*/
		xaxis label="Weighing point" discreteorder=data;
	  	yaxis label="Weights (Kg)" ;
		run;
It produces the below plot .
I have looked elsewhere but cannot seem to find if it possible to add in significance indicators on this chart? 

Thanks,
D

[Ksharp]

https://blogs.sas.com/content/graphicallyspeaking/2013/01/21/bar-chart-with-target-and-attribute-map...

https://blogs.sas.com/content/graphicallyspeaking/2017/07/30/clinical-graphs-waterfall-plot/
https://blogs.sas.com/content/iml/2017/11/20/simulate-beta-binomial-sas.html