This feature can be implemented by leveraging the WebView's built in 'find in page' functionality. On Android, the WebView class provides methods like findAllAsync and findNext. On iOS, WKWebView supports searching via JavaScript. The plugin should expose a Dart method that triggers the native search and highlights results. Relevant files to modify are the Android native handler (likely in java/) and iOS handler (likely in ios/), as well as the Dart interface in flutter webview plugin.dart.
