I started using the Epic Sum Up add-on for this about a year ago. Simple to set up and very easy to use. You can find it in the Marketplace right here: https://marketplace.atlassian.com/plugins/aptis.plugins.epicSumUp/cloud/overview
The PRO version is commercial, but there's also a free version that has the key functionality you are referring to: https://marketplace.atlassian.com/plugins/aptis.plugins.epicSumUpFree/cloud/overview.
(it's available for cloud and server)
Laura, you should create an Excel pivot table with the following dimensions:
The Better Excel Plugin has a worklog-report.xlsx template that you could use as starting point.
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