This currently isn't possibly to automatically indent the original quote in a reply, you can use the Markdown formatting to manually indent the quote, and then write your reply above that in a comment.
To read up on how to format comments in Trello, read our article here: http://help.trello.com/article/821-using-markdown-in-trello
I hope that helps!
If you had to thrive a new habit during a lockdown, what would it be? Trello
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