How to add a link/button to an automated response that populates a field in the ticket?

Has anyone ever created a link that populates a field in a ticket? Something like the CSAT rating emails that have the ratings right there in the message for requesters to click because of the {{satisfaction.rating_section}}​ placeholder.

Use case: We want to send an automated message to customers with tickets that have been escalated but are waiting for longer than they should. In the response, we'd request that they "click here" if their ticket meets certain criteria.

The idea would be to then review those "critical" tickets before we continue down the regular priority order we usually work off of. So anything works, a tag added, a field filled, etc.