A dogfight scenario is exactly the point where the f-35 loses it's primary advantage, stealth is meaningless in these close range fights. An f-35 wanting to take out 3 J-10s would use its superior sensors to locate and get within range of the J-10s and fire off some AMRAAMs without the enemy knowing they are even there until the missiles are closing in on them. Even if the missiles don't manage to take out the planes, they will be too busy trying to evade to try to locate the F-35, allowing it to slip away. At least that's the theory.

ADDENDUM: this is a somewhat related article https://warontherocks.com/2019/03/the-developing-fight-for-t... that talks about the comparison between a bunch of cheap drones vs. a single F-35 in terms of combat capabilities.