I'm trying to define an attribute as required with the following config

ez_platform_form_builder:
    fields:
        button:
            attributes:
                notification_email:
                    validators:
                        required:
                            options: {}

Opening the editor gives me an error Message when i try to edit that field: "Notice: Undefined index: message". Called in in vendor/ezsystems/ezplatform-form-builder/src/lib/Definition/Validator/ConstraintFactory.php (line 43)

When i add the field "message"

 ez_platform_form_builder:
    fields:
        button:
            attributes:
                notification_email:
                    validators:
                        required:
                            options: {}
                            message: "required"

it gives me another error "The option "message" does not exist in constraint "Symfony\Component\Validator\Constraints\Required"."

So there is no way to mark the attribute as required