1 to many relationship adding multiple objects

I have a 1 - * relationship (1 question, * answers). I am calling a get REST service in a microflow that passes a question and returns a list of answers. the service is working perfect.

How do I connect that list of questions with the current question (passed to the microflow as a parameter)?

When I try to change the Question object, I have no way of adding the list or even objects.