This feature will be released very soon!
Git for Confluence allows you to share public and private folders on your Confluence pages. Sharing private folders on your behalf will make it possible to share private content from your git provider with a Confluence page.
Public folder
This is a public resource in Github. Try to press the link in the header of the macro on you’ll see that you can publicly access this resource on Github as well.
https://github.com/avisi-apps/git-for-confluence-reference-cloud/tree/main/formats/markdown
Private file
This resource is shared from a private repository in Github. It is only available to you on this Confluence page because Willem Jan has shared it with this specific page.