How? Server-side means the content isn't even sent to the browser. What can the browser do?
https://gitlab.com/magnolia1234/bypass-paywalls-chrome-clean
https://gitlab.com/magnolia1234/bypass-paywalls-chrome-clean...
It is a 5000 piece of if else conditions where the author has handled each website separately.
The author is few techniques like - redirecting to amp websites / mobile websites - checking google cache for the mobile data - removing paywall modals which might be coming
Just from the look of the couple of implementations, i don't think it will be able to render server side paywalls.
Look at the implementation for medium.com, it is just about manipulating the dom. (I might be wrong :))