Need information on how Jira Data Center can be integrated with Power BI without any Atlassian market place plugin.
You Jira instance saves the data in a database. As part of your Jira setup you had defined the connection to it. See here https://confluence.atlassian.com/adminjiraserver/connecting-jira-applications-to-a-database-938846850.html. You can use this database connection parameters to connect to the database via ODBC or other database driver and use it for analysis in PowerBI. It would be useful to create a separate user to connect to the database that has only read permission.