No way to load JS files

Bug description: Im creating port of AmCharts for react-native using @rn-community/rn-webview to render webview and show charts in it. Facing error when Im trying to load main amcharts.js file in injected js code:

Error: 'src/components/AmCharts/amcharts-files/amcharts.js' cannot be loaded as its extension is not registered in assetExts

To Reproduce:

const runFirst = `
    function loadScripts(file, callback) {
      var xhttp = new XMLHttpRequest();

      xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {       
          var amcScript = document.createElement('script');
          amcScript.innerHTML = this.responseText;
          document.body.appendChild(amcScript);

          if (callback) {
            callback.call();
          }
        }
      };

      xhttp.open("GET", '${scriptsPath}' + file + '.js', true);
      xhttp.send();
    }
    
    loadScripts('amcharts', () => alert('ok'));
    `;

<WebView
          source={amchartsLayout}
          originWhitelist={['*']}

          injectedJavaScript={runFirst}
          mixedContentMode="always"
          allowFileAccessFromFileURLs
          automaticallyAdjustContentInsets
          allowFileAccess
          javaScriptEnabled
          domStorageEnabled
          useWebKit
/>

Expected behavior: Js would be loaded properly without any errors.

Investigation: Guys had same problems when they trying to use highcarts-react-native lib with this @rn-community/rn-webview package: https://github.com/highcharts/highcharts-react-native/issues/4 https://github.com/highcharts/highcharts-react-native/issues/8

Environment:

• OS: macos, iOS
• OS version: iOS 13
• react-native version: 0.61
• react-native-webview version: 8.0.5