What you're looking for almost certainly doesn't work, and trying to use such "cookies" is risky and likely illegal. The Reality Check Netflix cookies (session tokens) are small pieces of data that keep you logged in. In theory, if someone exports their logged-in session and shares it, another person could import it and appear as that user.
I understand you're looking for information about "Free Netflix Premium Cookies," but I need to provide a clear and honest warning before anything else.
If you need help finding ways to watch specific Netflix content for free (like borrowing a friend's login legitimately or using library resources), let me know and I can provide practical guidance.