<Heatmap
  slots={{ cell: CustomCell }}
  xAxis={[{ data: [1, 2, 3, 4] }]}
  yAxis={[{ data: ['A', 'B', 'C', 'D', 'E'] }]}
  series={[{ data, highlightScope: { highlight: 'item' } }]}
  margin={{ top: 5, right: 5, left: 20 }}
  height={300}
/>