There is no support for Costs yet in Timesheet Reports and Gadgets for Jira Cloud or Time Reports for Jira Cloud or Server, there is one only in Timesheet Reports and Gadgets for Jira Server, please see https://www.primetimesheet.net/wiki/Tips_and_Tricks.html#Cost_report_based_on_the_timesheet_information.
If you're interested in something similar or different (possibility to generate Invoices), please let us know at any way convenient for you, e.g. Leave a Comment below or Suggest Improvement at Support Portal.
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