formatter: function (value, context) {
              var result = value
                .toString()
                .replace(/\B(?=(\d{3})+(?!\d))/g, ",");

              var index = context.dataIndex;
              var fontWeight = index === 0 ? 700 : 500;
              return {
                value: result,
                font: {
                  weight: fontWeight,
                },
              };

              return result;
            },