Hi @Noa Buchman,
Assuming you refer to the basic roadmap - not advanced roadmaps of the premium plan - they are a feature you toggle on or off for an entire project. So you can't target specific users to see it or not.
Regarding project permissions, check out Project permissions documentation. Mind the difference between classic and next-gen projects and make sure to check out the guidelines that apply to your project.
Catch up with Atlassian Product Managers in our 2020 Demo Den round-up! From Advanced Roadmaps to Code in Jira to Next-Gen Workflows, check out the videos below to help up-level your work in the new ...
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