I'm not sure I understand your question. You can create articles in Confluence (set a space as a knowledge base) and link them to a JIRA Service Desk. After you set up your knowledge base space, the issue view displays a panel that displays related knowledge base articles. If there isn't a relevant article, you can create a new article from the issue. This page from the Atlassian documentation describes how to set this up:
Is this what you mean?
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