evalJavaScript example wanted

I want my Flutter app to
1. get a web page with a given URL
2. enter text in an input field in the web page and hit Enter
3. parse the HTML returned by the web server to find some requested data

Can this be done with flutter_webview using evalJavaScript?

For example
1. get https://www.wikipedia.org/
2. Enter text "trump" and hit Enter
3. Locate Donald Trump – Wikipedia in the returned html and determine his first name from the title

How can my app do this?