React There is a chart instance already initialized on the dom

If you have already initialized a chart instance in a React application, you can access it using a ref. Here's an example:

import React, { useRef, useEffect } from 'react';
import Chart from 'chart.js';

const MyChartComponent = () => {
  const chartRef = useRef(null);

  useEffect(() => {
    // Access the chart instance using the ref
    const chartInstance = chartRef.current;

    // You can modify or interact with the chart instance here

    // Clean up when the component unmounts
    return () => {
      // Destroy the chart instance if needed
      if (chartInstance) {
        chartInstance.destroy();
      }
    };
  }, []);

  return <canvas ref={chartRef} />;
};

export default MyChartComponent;

In this example, the `chartRef` is used to access the chart instance. You can modify or interact with the chart instance within the `useEffect` hook. Don't forget to clean up the chart instance when the component unmounts to avoid memory leaks.