React Native
React Native uses a different approach as Cordova or Capacitor: instead of rendering into a WebView, a kind of embeddable web browser, it uses JavaScript running in a custom execution environment (for details, see here) and uses native components to render its content.
Using STRICH with React Native is not something we test or officially support.
While it is possible to integrate STRICH into a React Native app using the react-native-webview package, there are better supported and more straightforward ways to integrate barcode scanning into a React Native app, like the VisionCamera library.