The best time to truly implement the Markdown markup language into Google Docs was in the early 2010s, but yesterday was a pretty good time, too. You could write in Markdown in Docs, but you could not paste, nor could you import or export between Docs and Markdown styling. Docs can convert Markdown text to its equivalent Docs formatting on paste or when imported as a file, and it can export to Markdown from the copy menu or as a file.

Source: Real, actual Markdown support is arriving in Google Docs, not a moment too soon

Good! Google docs is great for prose, but the simplicity is markdown is great too