A Google Docs add-on for redering Docs as Markdown.
You can install this as a Google Docs add-on in the Chrome Web Store. This will make the add-on available for all of your Google Docs.
When viewing a Google Doc, click the Render document item in the Markdown Preview add-on menu.
This will display the Google Doc as rendered markdown.
Please open an issue or pull request if you run into any issues with the add-on.