JReport offers an Amazon Redshift connection via a JDBC connection.
For more information, head over to their support documentation for adding a JDBC connection: https://www.jinfonet.com/kbase/designer15/userguide/HTML/connection/cnctn_jdbc_set_redshift.htm
Credentials are provided during implementation. If you do not have credentials, or have issues logging in, please reach out to the Ease support desk.