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Find more details about creating and activating the Custom fields for the Next-gen Project here: Next-gen Project and Classic projects here: Classic Project
Why it’s useful to sync SLA Time and Report data and Jira Custom Fields:
Use Native Jira Cloud Gadget to display SLA data. Check the instruction here.
Use JQL to filter issue using SLA Config name.
Haven't used this add-on yet, then try it now! >>>