Welcome to the Make community!
You can access dynamic keys and it’s values by first using the built-in function toArray on the collection variable data.
This can be done in a set variable or iterator module.
Hope this helps! Let me know if there are any further questions or issues.
— @samliew
P.S.: Did you know, the concepts of about 70% of questions asked on this forum are already covered in the Make Academy. Investing some effort into it will save you lots of time and frustration using Make later!