How to create a kubernetes namespace in an idempotent way with AWS CDK

How can I create a k8s namespace manifest in an idempotent way or ignore the error if the namespace already exist with AWS CDK.

If I create a K8s namespace with a manifest, I regularly get errors that the namespace already exists:

from custom resource. Message returned: Error: b'Error from server (AlreadyExists): error when creating "/tmp/manifest.yaml": namespaces "dev-advanced" already exists\n

Create Manifest:

    def create_namespace(self) -> KubernetesManifest:
        m = self.cluster.add_manifest(
            f"ns_{self.tenant.name}",
            {
                "apiVersion": "v1",
                "kind": "Namespace",
                "metadata": {
                    "name": f"{self.tenant.name}",
                    "labels": {
                        "name": f"{self.tenant.name}"
                    }
                }
            }
        )
        return m