how can i display text at the corner of the axis

[hongpatipan]

how can i display text at the corner of the axis

Now I customize it myself.

const options = {
    chart: {
      type: "heatmap",
      toolbar: {
        show: false,
      },
      stackOnlyBar: false,
      events: {
        dataPointSelection: function (event, chartContext, config) {
          const { seriesIndex, dataPointIndex } = config;

          const cameraName = staticData[seriesIndex].name;
          const category = categories[dataPointIndex];

          setSelectedCamera(cameraName);
          setSelectedCategory(category);
        },
      },
    },
    dataLabels: {
      enabled: false,
    },
    colors: ["back"],
    stroke: {
      width: 4,
    },
    legend: {
      show: false,
    },
    plotOptions: {
      heatmap: {
        enableShades: false,
        colorScale: {
          ranges: [
            {
              from: -999999,
              to: -1,
              color: "#CFCFCF",
            },
            {
              from: 0,
              to: 0,
              color: "#26C193",
            },
            {
              from: 1,
              to: 999999998,
              color: "#FDCC4E",
            },
            {
              from: 999999999,
              to: 999999999,
              color: "#F5FAFE",
            },
          ],
        },
      },
    },
    xaxis: {
      axisTicks: {
        show: false,
      },
      position: "top",
      categories: categories,
      // tickAmount: 23,
      labels: {
        style: {
          fontSize: "14px",
        },
      },
      title: {
        text: "Text at Y-Axis Corner",
        style: {
          fontSize: "14px",
          color: "#000",
          marginLeft: "1000px"
          
        },
      },
    },
    yaxis: {
      tickAmount: 10,
      labels: {
        style: {
          fontSize: "14px",
        },
      }
    },
  };