Is it possible to add scripts from index.html to index.js in React

Question

i need to add a several scripts from index.html to index.js page. Although when try to add them i receive dom errors.

ReactDOM.render(
  <React.StrictMode>
    <App />
      <script>
        var appLocation = './';
        var boilerplatePath = '';
        var systemJsMap = {
        '@ag-grid-community/all-modules/dist/styles/ag-grid.css':
          'https://unpkg.com/@ag-grid-community/all-modules@24.0.0/dist/styles/ag-grid.css',
       },
    </script>
      <script src ="https://unpkg.com/systemjs@0.19.39/dist/system.src.js">
      </script>
      <script src="systemjs.config.js"></script>
  </React.StrictMode>,
  document.getElementById('root')
);

Does anyone knows is it possible to add those scripts to index.js ? Or i need to somehow modify the structure of scripts ?