No, there isn't a way modify GitHub's UI in that way. But you could easily create some process on your team or in your organization that uses the comment field in that way. You could use emoji for this too. For example:
I hope that helps!
Thanks for your reply.
But this will not help in my case. As in organization, we and our client's employees both commit the changes on github. That's the large group of people working on many projects together. It will be difficult to implement the rule on organization basis.