WKWebView doesn’t work with my angular2+ cordova app

I added cordova to my angular2+ app and I’m trying to install WKWebView to make this app faster on mobile phone.
How to check is it works with my app? I don’t know how to add it correctly. I installed plugin, added to package.json.
I added to config.xml:

    <feature name="CDVWKWebViewEngine">
        <param name="ios-package" value="CDVWKWebViewEngine" />
    </feature>
    <preference name="CordovaWebViewEngine" value="CDVWKWebViewEngine" />
    <preference name="WKWebViewOnly" value="true" />```


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