Unfortunately, the feature to create Confluence page from inside JIRA is not implemented on JIRA yet.
However, there is a open feature request, for this to be implemented.
You can access it here: https://jira.atlassian.com/browse/JRACLOUD-39655
Please, I recommend you to add yourself as watcher and to vote in the ticket. This way, it will gain visibility to our developers.
If you have further doubts regarding to our policy of new feature, you can access the below link.
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