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Nice. I didn't even knew about '>' and even less what you just mentioned.

Oh, I didn't know that.
Still, it would be good to mention in the comment to put quoted text after a '>' symbol to distinguish it from their own words.
... thanks

Is there an ending symbol to put after the text or does the quotation end with a return key press?

No. Just type it this way ➟ >This is quoted text. This is quoted text.

and it will appear like below.

This is quoted text. This is quoted text. This is quoted text. This is quoted text. This is quoted text. This is quoted text.

Yep, it's good practice for sure. & I might actually link this FAQ in the comment.