<PieChart
  series={[
    {
      arcLabel: (item) => `${item.value}%`,
      arcLabelMinAngle: 35,
      arcLabelRadius: '60%',
      ...data,
    },
  ]}
  sx={{
    [`& .${pieArcLabelClasses.root}`]: {
      fontWeight: 'bold',
    },
  }}
  {...size}
/>