The Tree viewer supports exporting the current displayed data into an Excel file and on the JIRA Issue Detail view. These options are available from the More… menu:

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As mentioned, you have to configure  CVS (Excel in older versions than 7.2)  to export report from the Issue Navigator (Columns button) in order to get the same configuration on Links Hierarchy:

The exported Excel file supports the same hierarchy than the add-on, so rows can be collapsed and expanded:

Exporting to JQL (and Bulk changes)

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