Line Manager Approvals and working with variables on Flow Designer

[Alp Utku]

Hello all,

I have questions regarding flow designer and approvals. 

1. I would like to trigger line manager approval of Requested For person? How do I achieve this in Flow Designer?
2. How can I trigger variable based approvals via Flow Designer? On the workflow, I was using below syntax accordingly. Is there any similar way to do It via Flow Designer?

answer = [] ;

answer.push(current.variables.<variable_name>) ;

 3. What is the equvilent of current.variables.<variable_name> on Flow Designer? What should I do, If I want to make decisions in Flow Designer based on the variable selection(s) using If condition?

Thanks for your help in advance.