Problem in adding different 'data' 'value' variable in echarts

Question

Here's the link to my example https://echarts.apache.org/examples/en/editor.html?c=sunburst-visualMap

The data has keys such as name, value and children. I want the above example to plot the map using 'score' instead of 'value' in the visual Map.

I tried using a formatter function inside the 'label' which isn't working.

formatter: function (param) { console.log(param); return param.data.score; }