How to define error messages for base errors in locales?

Support dry-validation
1

How to define error messages for base errors in locales?

class Validator < Dry::Validation::Contract
  config.messages.default_locale = I18n.default_locale
  config.messages.backend = :i18n
  config.messages.top_namespace = :validator

  schema do
    optional(:id).maybe(:integer)
  end
  
  rule do
    base.failure(:invalid)
  end
end

en:
  validator:
    errors:
      invalid: This is. invalid
      ~:
        invalid: This is invalid
      "":
        invalid: This is invalid

Validator.new.call({})
# => Dry::Validation::MissingMessageError (Message template for :invalid under "" was not found)

Is there any way other than doing something like the below?

base.failure(I18n.t('validator.errors.base.invalid'))

en:
  validator:
    errors:
      base:
        invalid: This is invalid