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?

The issue does not name a file, test, or entry point. First clarify whether an evalJavaScript example is wanted and what supported workflow it should demonstrate, including page loading, form submission, and reading the resulting title; done means the example is documented and its behavior is verified.

Written by the indexing model from the issue text.