Add same Email Subject for all emails that were sent by the System

As an administrator, manage 10-15 Service Ticket/Cases in one month. Which results in long threads of emails with ServiceNow, and support teams. In ServiceNow, I am receiving each email from the system as separated emails with different email subjects. See Figure 1 for example. As a result, I am unable to group threads in my email client. Please maintain the same email subject pertaining to one Case Number.