Is it possible for FlutterFlow to receive and react to messages from a webview

I tried using a custom widget with an iframe to load the webview and listen for messages sent from the webview’s JavaScript using window.postMessage. I set up code to detect those messages and pass the data back to FlutterFlow, but FlutterFlow didn’t recognize the custom widget properly or couldn’t handle the message callback. I also tried creating a custom action to save the data after receiving it, but the communication between the webview and FlutterFlow didn’t work as expected. I considered polling the webview from FlutterFlow periodically, but that approach seems unreliable and expensive.