The following issue occurs on warmup

Uncaught Error: Attribute "Symfony\Component\DependencyInjection\Attribute\AutowireLocator" cannot target property (allowed targets: parameter)

This attribute(Symfony\Component\DependencyInjection\Attribute\AutowireLocator) for example is allowed by symfony to be used for properties in a CPP definition

 public function __construct(
        #[AutowireLocator(FooLocatedService::class)]
        private ContainerInterface $foos,
    ) {
    }

So i think this should be allowed by ecotone too