Whitelisting URL’s is to allow you to use a <a href="https://google.com/" target="_blank">Link</a> it is not for things you want to do a JS Fetch on.
You have misunderstood the purpose of the Whitelist.
You can JS Fetch to anything you want.
But Google disallows this, as Google has no CORS headers applied. As Google Doesn’t want you to JS Fetch Google.