I hope you are having a nice day.
Unfortunately, at the moment it only pertains to Jira Cloud and Jira server doesn't have this roadmap feature yet.
I can see that Atlassian already has a feature request to implement it in the feature and you can check it here JSWSERVER-19614.
I strongly recommend voting for the issue and keep watching it for any updates. Additionally, it is a nice approach to give your comments there so Atlassian can understand how this feature would have a positive impact on your business case.
Additionally, I checked one post from an Atlassian team member that for anyone looking for this kind of Roadmap feature in the Server versions of Jira, you might want to take a look at the Atlassian Marketplace site. A quick search shows 20 different titles for that term that are specific to Jira Server: https://marketplace.atlassian.com/search?hosting=server&product=jira&query=roadmap
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