I want to use Jira to simplify the creation and management of Roadmaps.
@Bill Westerman Jack's advice above is great, and I'll also move this to the Jira collection so you may get insight from others.
I would take a hard look at Structure for Jira. It doesn't produce the prettiest roadmap, but the gantt add-on will build one, and the automation options it has are hands down the best.
Easy Agile Roadmaps looks pretty nice, but doesn't have a lot of options. Simple Version Roadmap is extremely basic, and you will need to have good discipline around version management.
Epic Roadmap willbring you the next-gen features you are asking for if you are on-prem.
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