Sorry, but there is no way to do this out of the box at all. You can assemble the answers on each quiz slide, using the system variable cpQuizInfoAnswerChoice which is reused on each slide. You'll need to transfer its value to user variables, one for each quiz slide. Then you'll have to translate those values to the format you want. How will you squeeze that on one result slide?
Maybe this older blog post could give you some ideas?