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No. This feature is not available yet. Please vote on it.
How can I migrate the app data to Confluence Cloud?
Unfortunately, our app is unavailable on Confluence Cloud. You can vote on the Cloud version.
However, you can successfully migrate attachments added via our app themselves. The app stores attachments on hidden from the Confluence sidebar pages. You can see them in the page tree when reordering space pages as those starting with numbers. Also you can uninstall the app from Confluence Server and see the respective pages. Thus, all the attachments used in our app will be migrated as any other attachments in Confluence.