I just fixed a similar problem.
My problem: I am receiving all my custom questions and answers from Calendly but as an array under “Questions And Answers” same as your screenshot above. I just needed the first answer value which in my case was the phone number.
Solution: used get() and map() functions used in this video tutorial https://www.youtube.com/watch?v=W9CgDTeppmE and got my answer in this format: get(map(63.questions_and_answers; “answer”; “position”; 0); 1)