There is no one with a "chin" who can take Ngannou's power because getting KO'd at heavyweight is not about how good your "chin" is. Anyone can get knocked out at Heavyweight, especially against guys like Ngannou.
In their second fight, Miocic demonstrated ridiculous durability, a prime example of someone who can take a lot of damage, but still ended up getting KO'd. If you keep getting hit by someone like Ngannou, you're going to get put down eventually, doesn't matter how well you can take it. Even guys with unreal ability to take shots like Mark Hunt and Roy Nelson have been KO'd.
If you don't want to get KO'd by Ngannou, you don't do it by having a "chin" that can take his shots, you do it by not getting hit in the first place like Stipe in the first fight.