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1. Create a form where users can input the data they wish to be plotted.
2. Add an event handler that listens to when the user submits the form.
3. In the event handler, retrieve the data from the form and store it in an array or object.
4. Pass the data to the Chartjs component as a prop.
5. Inside the Chartjs component, configure the chart to render the data as desired.
6. Render the chart.

Here's an example code snippet:

import React, { useState } from 'react';
import { Line } from 'react-chartjs-2';

const ChartComponent = () => {
  const [data, setData] = useState([]);

  const handleSubmit = (e) => {
    e.preventDefault();
    const newData = { /* Retrieve data from form */ };
    setData([...data, newData]);
  }

  return (
    <div>
      <form onSubmit={handleSubmit}>
        {/* Form inputs here */}
        <button type="submit">Add data</button>
      </form>
      <Line data={data} options={{ /* Chart options */ }} />
    </div>
  );
}

Note: This is just a basic example, and you'll need to customize it to fit your specific use case.