JIRA has block format styles for code and for preformatted text. Unlike many other issue trackers, it does not offer a dedicated inline style for code (like Markdown's `code`). But it has a 'preformatted' inline style that can be (ab-)used for short, inline code fragments, to at least get a monospaced font style.

One huge problem with this approach is that the preformatted inline style still applies nested markup and - more annoyingly - emoji replacement, as can be seen in this example (:imaginary code snippet

I would suggest to either introduce a new inline style akin to {{noformat}}, or better yet, make the inline preformatted style work that way by default (of course the dream would be to have a dedicated inline `code` style).