Zoom control and Anchor Link(Jump Link) for Xamarin.Forms WebView

I am working on a project using Xamarin.Forms. In my project I have loaded Html data on WebView from local database. How can I control zoom functionality for xamarin.forms webview and how to jump to a anchor link using javascript or any given api?
I have already used to jump a anchor link in my Android project using javascript like webView().LoadUrl ("javascript:document.getElementsByClassName('Tag Name')["+position+"].scrollIntoView();"); .
It will be helpful if I get a urgent solution.