Validation of a field durning import

I have a question regarding data import. While importing data into a field, we can designate the field as required during import. However, we also have a specific requirement that goes beyond mere necessity. The field must not only be mandatory but also adhere to a specific length criterion. For instance, in our case, the field must be precisely 9 characters long. Any deviation from this length, whether shorter or longer, should be considered invalid.

Adding indexes can be found at support.sugarcrm.com/.../

Thoughts?