Hello There! Hope you are fine?
I'm a Senior Software Engineer/Architect with 8+ years of experience in Android and Web Mobile App Development, predominantly working in top Product Based Companies.
I have been doing webview works from quite a long time, in app's used downloaded by a million users, which I guess makes me a good candidate for this. Moreover, I can advice you if there are any security risks of the webview implementation, and make it a highly secure and scalable webapp.
For just the adding webview part, it will be done in a day (I prefer weekends).