Hi everyone! While this feature request for Confluence Server is not in the roadmap yet, I would like to share that we have released an app that could export Confluence Cloud pages as Salesforce Knowledge Articles.
Please feel free to check the app from this Atlassian Marketplace listing: Salesforce & Confluence Cloud Publisher
The app is currently listed as a Beta app, and any feedback or improvement requests are most welcomed.
Monique, Confluence Cloud Apps Product Team