I'm sorry, but the knowledge sources do not contain any information about support for the idn-email format in identity JSON schemas in Ory Kratos. The documentation and examples reference the use of the email format (e.g., "format": "email") for email fields, but there is no mention of idn-email or its support in the context of JSON Schema draft 7 or Ory Kratos specifically. If you require support for internationalized email addresses, you may need to test this directly or consult the Ory community for further clarification[Customize identity schemas - Ory Kratos](
https://www.ory.sh/docs/kratos/manage-identities/customize-identity-schema#examples).