From the Jira documentation:
Enable/disable the Roadmap
1. Navigate to your next-gen Jira Software project.
2. From your project's sidebar, select Project settings > Features.
3. Enable or disable the Roadmaps feature.
However, I do not have the Features option in Project Settings. I am the owner of the project.
Do you know if the Roadmap feature still exists and how to enable it?
Thanks!