How do I add custom schema with host part like in CefRegisterSchemeHandlerFactory ?

[valapran-flutterint]

In CEF I can add custom schema to existing protocol such as http
CefRegisterSchemeHandlerFactory(L"http", L"test", new SchemeHandlerFactory); How do I achieve the same using WebView?

I know there is AddWebResourceRequestedFilter and I can filter out requests, but is not working well if I register a callback with add_WebResourceRequested and use ICoreWebView2WebResourceRequestedEventArgs::GetDeferral to complete the task async. It loads the page and it takes more time at least 2 sec