How to make rejection comments required?

Summary:

Need to make reject comments required.

Content (please ensure you mask any confidential information):

Hi,

Is there a way we can make reject comments a required field? We need to prevent manager from rejecting approvals without describing their reasons.

We didn't want to create a custom field for that. We'd like to use the standard fiel which is concatenated to the approval history.

Is it possible?

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

24A

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