The U.S. would likely keep the fighting at sea, blocking China’s access to the global market and using stealth aircraft like the B-21 first to disrupt China’s anti-ship capabilities, and then closing with Chinese shores enough to begin launching sorties of strike aircraft aimed at pounding China’s military and industrial infrastructure into submission.
https://nationalinterest.org/blog/reboot/how-b-21-raider-would-be-critical-war-china-199626