Short answer: NO. If you know what I mean.
It seems that YAML's drawbacks have created a niche for alternative better YAMLs. NEON is developed as a part of the Nette Framework and also gained some popularity as a format for PHPStan configs. But is it a better YAML?
Well, YAML's Norway Problem...
Weird but valid PHP specific syntax:
Okay, maybe its weird killer feature, entities, is useful for somebody but the rest of the language looks like a worse YAML to me.
Weirdly significant whitespace:
... WTF? I mean, this is fine and logical but it makes the previous example even worse.