There are ways discussed before to contruct a url to link to the JIRA create issue support and fill in parameters. You can use the Run Plugin for Confluence to construct a user form to drive that. If you want to create the JIRA item directly under the covers for the user, then CLI Plugin for Confluence can remotely create the issue.
You only need the run plugin if you want the user to enter data before going to the link. Here is an example link:
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