How to show brand account details upfront in a fan message in conversation?

Updated 

When messages sent to multiple brand accounts are there in one case and the agents also have access to the multiple brand accounts and they want to see the brand handle to which the message was sent upfront in the conversation so that they can reply using the same brand handle so they can view the brand account name to which the customer message was sent to.

Enablement note :

To learn more about getting this capability enabled in your environment, please work with your Success Manager.