You might be able to get this done with the Extension for JIRA Service Desk add-on. It offers the possibility to calculate an SLA based on a date (such as due date) and it allows you to show the SLA timer on the customer portal.
The add-on is commercial. So if you are looking for a workaround, you can always mention the due date in a comment to your customer as soon as you decide to set one.
...word of mouth, so by 2016, we were working with several other entities on campus to implement Jira Service Desk . The Atlassian motto of “for every team” has really come true for us in this case. We...
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