When it comes to Jira/Confluence Data Center applications deployed to AWS infrastructure, it's straightforward these days to export their databases as Apache Parquet databricks and their attachments folders to S3 buckets. Once there, Amazon Macie could be used to scan this exported Jira/Confluence data for PII.
Have you done this? Can you comment on your experience, such as, was it challenging to match findings back to the Jira/Confluence apps? Are the exported Parquet databricks in a format that enables PII discovery?