Heatmap Data Label color to red based on X and Y coordinates

Question

I'm trying to highlight a single cell datalabel based on x and y coordinates of heatmap. refer this fiddle, where it is implemented as i'm using it inside jasper this approach is not working properly. Can any one show me how to do it using formatter.

series:{ 
     data: data,
     dataLabels: {
                /*formatter:function(){ i'm having x and y cordinates and i wanted to plot the lable color and it should be surrounded with a square as given in sample fiddle*/}}

TIA