How to make Cancellation Reason mandatory when cancelling a sales order - Header and Line Level

Summary:

Can someone help with setups or a complete OM extension for how to make the cancellation reason field mandatory when cancelling a sales order?

Content (please ensure you mask any confidential information):

MAKE THIS MANDATORY AT THE HEADER LEVEL

MAKE THIS MANDATORY AT THE LINE LEVEL

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):