Installing WKWebView plugin


I’m trying to install the cordova-plugin-ionic-webview plugin because of the deprecation of UIWebView for future iOS releases.
I’ve also added <preference name="WKWebViewOnly" value="true" /> to the config.xml.

But unfortunately now when running on Android I get following error: ERR_FILE_NOT_FOUND(file:///android_asset/www/index.html)

What else do I have to do? The documentation on the Ionic announcement does not show any more steps:

@Thilo1992 How did you manage to solve this?