Hello, I've successfully created the widget to support optgroup select (i.e. categories inside a select). I'm now seeking help for the validation.

In order to generate the categories I give a dict instead of a list to my "enum" field. How can I modify the JSON validation to avoid the error .enum should be array

Here is the codepen of my implementation:
https://codepen.io/enola-guy/pen/ZEQOVEN

If you can explain me the steps missing, I would gladly open a PR in order to make this feature in the main branch :)