For manager who wants to extend reporting of time logged with Tempo, it is possible to build reports with correct Tempo data now.
To integrate apps please generate API token in Tempo settings.
Insert it into appropriate field in User Preferences Timesheet app.
Use Flexible reports, including filtering Billable hours (support for other Worklog Attributes may be added on your demand):
Please note, in case of Tempo token set in config, logging time via Timesheet app does not allow to specify Tempo Worklog Attributes or billable/non-billable hours and Worklog Visibility.
Additionally, REST api supports billableWorklogs query param and Tempo worklog attributes.