As of today, the roadmaps feature is only available for the next-gen project type in Jira Software Cloud. We do not have plans to bring the roadmaps feature or next-gen project type from Jira Cloud to Jira Server or Jira Data Center.
Atlassian's Cloud and Self-hosted product offerings are developed independently, which allows us to make the best prioritization decisions for each set of customers. For the self-hosted versions of Jira, this meant taking a different approach involving supporting more advanced planning, cross-project dependency management, capacity planning and global releases. All of which require a specialized tool - Portfolio for Jira Server and Data Center.
While we are not committed to building out new roadmapping capabilities directly within Jira Server or Data Center, our team is working closely with the Portfolio for Jira team to improve the overlapping functionality of these offerings.
That said, we strongly encourage you to check out our latest Portfolio for Jira Server and Data Center 3.0 platform release. In it, we have completely reimagined Portfolio to make it more simple and intuitive to use, flexible to your planning style and process, and transparent for all users. We think you'll like what you see.
Alternatively, we suggest you to check out the Atlassian Marketplace for other solutions to meet your needs.
To learn more about our recent investments in Jira Server and Data Center, please check out our dashboards showing Recently resolved issues and Current work and future plans.
Best regards,
The Jira Server and Data Center Team