How can I register custom scheme in UWP app?

[ricklee7679]

Hello! I am using WebView2 ver. 1.0.2365.46 in a UWP app and unable to register a custom scheme (like mylocal://) in the following codes. I would like to register that custom scheme for firing [WebResourceRequested] event ( https://learn.microsoft.com/en-us/dotnet/api/microsoft.web.webview2.core.corewebview2.webresourcerequested?view=webview2-dotnet-1.0.2365.46) event. Right now, the event only happens with https://, http:// schemes.

var customSchemeRegistration = new CoreWebView2CustomSchemeRegistration("mylocal")
{
	HasAuthorityComponent = true,
	TreatAsSecure = 1,
};
var customSchemeRegistrations = new List<CoreWebView2CustomSchemeRegistration>
{
	customSchemeRegistration
};
CoreWebView2EnvironmentOptions options = new CoreWebView2EnvironmentOptions
{
	CustomSchemeRegistrations = customSchemeRegistrations
};

CoreWebView2Environment env = await CoreWebView2Environment.CreateWithOptionsAsync("", "", options);

//await webView.EnsureCoreWebView2Async();

The above commented out EnsureCoreWebView2Async() of UWP cannot take params, and that makes the registration inapplicable.

Questions:

1. Is that a known issue in UWP? I saw WinUI3 had a similar issue that was recently resolved by supporting params in EnsureCoreWebView2Async().
2. This UWP SSO issue seems related, that it also uses CoreWebView2EnvironmentOptions, though it has a workaround. Do you see a workaround for setting custom scheme? assuming 1) is true.

Thanks