I can't find a way to do this. you can export the Google Doc to Word/docx format - which preserves the comments - but then when you import that into confluence, the comments get munged into the text.
If you embed the Google Doc into a confluence page using the Confluence Google Drive plugin, it doesn't show the comments.
Hi team, I’m Avinoam, a product manager on Confluence Cloud, and today I’m really excited to let the Community know that all customers can now try out the new editing experience and see some of the ...
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