Flutterflow.io Custom Widget

Hello, I created a flutterflow.io app. In this app, there is a webview that displays my webpage. Here is the problem. I have several javascript codes in this webpage, and one of them is converting speech-to-text via OpenAI. All the other javascript codes work just fine but this one does not work. My javascript code works on browsers perfectly but not on flutterflow app.
Another problem is I need the text on my website page to be selectable and copiable in the webview in the flutterflow app. However, I can't select the text from the webview page. I need some workarounds to fix this problem. Let me know if you are interested in the job.
Cheers.
Baris