Chartjs-How to integrate basic ChartJs customizations when using react-chartjs-2?

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Your options are wrong, you need to define the tooltip options in the options.plugins.tooltip namespace and not the options.tooltips namespace.

Example:

Chart.Tooltip.positioners.mouse = function(items, evtPos) {
  return evtPos
};

const options = {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        borderColor: 'pink'
      },
      {
        label: '# of Points',
        data: [7, 11, 5, 8, 3, 7],
        borderColor: 'orange'
      }
    ]
  },
  options: {
    plugins: {
      tooltip: {
        intersect: false,
        position: 'mouse',
      }
    }
  }
}

const ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
  <canvas id="chartJSContainer" width="600" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.8.0/chart.js"></script>
</body>

React import:

import { Chart, registerables, Tooltip } from "chart.js";
import { Chart as ReactChartJs } from "react-chartjs-2";

Chart.register(...registerables);

Tooltip.positioners.mouse = function(items, evtPos) {
  return evtPos
};

const options = {
  plugins: {
    tooltip: {
      position: 'mouse',
      intersect: false
    }
  }
}

<ReactChartJs type="line" data={data} options={options} />

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