Is it possible to create an identity schema with a custom "format" field for a trait property? We want to try and map the format field to frontend validation rules (e.g. form pre-submit validation).

you can specify regular expressions https://json-schema.org/understanding-json-schema/reference/string.html#index-12 or enums, depends on what you need

I don't see the enums? What I'm really looking for is to give each trait (field) in the identity schema a custom type that can be passed down through the registration flow api. We want a type hint beyond the json-schema types (string, object, etc) to indicate how we should display that field. For instance if it is a date, we want to show a datepicker, or if we want to tie custom functionality to a certain type of string.

we don't support anything outside of the json schema spec but the format should be passed down, so a date string can be displayed as a date picker you will have to use the JSON primitives anyway, and then there is always a way to describe it as a json schema

It doesn't seem like the Format is passed down during the registration flow though 😞