There is no built-in feature for that, reports are not exportable, unfortunately. The closest you can get is using the Better Excel Exporter app.
With this you can implement custom reports in Excel, so nothing prevents you to re-create those that are available in Jira's web interface.
(Discl. I'm a developer of this app.)
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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