Depends on what you mean by "Jira account", but assuming you mean "access to a specific Jira system", you will need to either
You need to contact the admins or owners and ask them, as you can't see a sign up.
I really cannot tell you more than that. Cloud alone has 125,000 separate Atlassian systems in use, and there are plenty of server/DC systems out there too. You have not told us which one(s) you want access to.
Hi All! We’re excited to share the launch of an announcement banner that lets Jira site administrators communicate directly to their users across their Jira Cloud instance. ...
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