How to enable routing of email activities from the same customer with the same subject line to the original agent who handled the initial email

Conversation Hub
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Use Case:

  1. A customer sends an email with the subject: “What is your pets’ policy.”
  2. The email is routed to Agent1.
  3. Before Agent1 responds, the customer sends a follow-up email with the subject: “Re: What is your pets policy.”
  4. This second email should also be routed to Agent1 to maintain continuity.

Note:
The Preferred Agent feature cannot be used in this scenario, as different agents may handle different cases from the same customer. Routing should be based on subject-line continuity, not customer identity