In additional with the other responses, as the SLA is viewed inside JIRA settings (On the Service Desk projects) and the Customers don't have access to it, this is currently not possible. By this reason, I'd suggest you to vote on the following issue to increase its popularity and add it to your watchlist for future updates:
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
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