Release Management is a fundamental part of IT Project Management. So of course companies use Jira to track releases. And of course you can tie milestones and OKRs to releases. And of course tickets can have small amounts of text content associated with them. How else would you describe the ticket without them ?

But the idea of Jira being remotely like a Confluence style wiki is just ridiculous.

And your comment is out of some parallel universe where Jira is Confluence.