Marketplace search is the best place to try! There are Atlassian Partners who will build custom integrations for you if there are specific features you know you need from an integration.
Having administered SharePoint instances in the past, I am a bit curious on what you'd be interested in doing with a SharePoint to Jira integration. There definitely is a SharePoint to Confluence integration that helps with federated search and letting you see SharePoint document libraries inside Confluence. Depending on what you are trying to do, there might be non-plugin options.
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