{
    eventName: "click",
    callback({}) {
      console.log("clicked");
    }
  }

<Chart
  chartType="ScatterChart"
  width="80%"
  height="400px"
  data={data}
  options={options}
  legendToggle
  chartEvents={[
    {
      eventName: "ready",
      callback: ({ chartWrapper, google }) => {
        const chart = chartWrapper.getChart();
        google.visualization.events.addListener(chart, "onmouseover", e => {
          const { row, column } = e;
          console.warn("MOUSE OVER ", { row, column });
        });
        google.visualization.events.addListener(chart, "onmouseout", e => {
          const { row, column } = e;
          console.warn("MOUSE OUT ", { row, column });
        });
      }
    }
  ]}
/>