Accessing user cookie data from the pages

[DryDemon]

On a project I need authentification from user. I use jwt cookies to do so.
I know I can use the api to verify the cookie and send data but that is 2-3 times slower to send the page, wait for the user to load him and then let him send a request to the api.
Fetching the data in the SSR time and directly integrating in the pages in much faster.
Is there any way to check the cookie value during SSR? I havn't found anything

If it does not exist yet, I think it would be a great feature.