readonly class Foo {
    public function __conctruct(
        #[SerializedPath("[one][two_three]")]
        public $fooBar,
    ) {
    }
}

$factory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
$normalizer = new ObjectNormalizer($factory, new CamelCaseToSnakeCaseNameConverter());
$serializer = new Serializer([$normalizer]);

$data = [
    'one' => [
        'two_three' => 'fooBar',
    ],
];
$foo = $serializer->denormalize($data, Foo::class, 'any');