To show the JIRA Metadata you will have to activate the "page-metadata-banner" dark feature. To do this:
You can then choose which elements from the "page-metadata-banner" you want to hide with CSS and/or use the HTML Copy Element macro to position the "#content-metadata-jira" somewhere else on the page.
Update for Theme Press 2.x: In order to display the JIRA tickets linked to a Confluence page, you will have to enable the "Metadata banner". You can achieve this by going to the page's layout and in "Page Elements" select the "Metadata Banner" to be visible either with the title or breadcrumbs. Note that the title or breadcrumbs will need to be visible as well. You can find more information on the following page:
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