Is it possible to expose the callback mechanism for the 'required_message' for forms and modal forms

[jwag59]

Since antd does not appear to support validation for form fields it means the validation has to made after form submission.
However without direct access to the form it is impossible to update the form with a message about failed validation.
If you could expose the call interface to the 'required_message' mechanism (or something similar) we could use this to feedback validation messages to the user.

Currently I'm using Notification to do this but obviously that message appears in the top right of the screen and disappears after a few seconds.