Change style of last yaxis label

[dafunq]

Hi!

I'm creating a heat map for test areas as rows and version under test as columns in apexcharts. I would like the last row of the heatmap to be sort of a total judgement of the testing of a version and thereby I would like the font of the label of the last row to become bold.

I tried using the labels formatter function available. But with it I cannot seem to find a way to modify the style of the value.

Is there any way to do this?

yaxis: {
            labels: {
              /**
              * Allows users to apply a custom formatter function to y-axis labels.
              *
              */
              formatter: function(value, timestamp, opts) {
                if (value === "Total") {
                    // I would like this to return Total but in bold text. 
                    return value;
                } else {
                    return value;
                }
              }
            }
},