How to implement NSTextFinderClient for multiple WKWebViews?

I want to implement content search for multiple webviews present in a container (ScrollView).
I have added the NSTextFinder instance to each webView making it as a client and findbarContainer as enclosing ScrollView
So its searching only in the current webview.
Is it possible to add a NSTextFinder object common to all webviews inside the container just like Apple's Native Mail Client?
Please let me if I have to implement NSTextFInderClient for the container and how to implement that as I am unable to find any reference regarding that.