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In case you have some custom field that groups Jira issues by some criteria (i.e. Customer) and you would like to get a report of all worklogs that are related to this custom field, you can generate Timesheet Report based on the Jira Saved Filter (JQL), that would look similarly to: customer = Customer A and then simply generate a Timesheet in ActivityTimeline based on this filter, which can later be exported into Excel format:
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