How to get the variable values in flow designer

Hi Team,

I have a flow designer, Once I submit the item, Ritm and sc_tasks are creating.

Now in sc_task short description I want to add one of the variable value in it.

I have added above one in my flow designer Action, this is coming in below way

Below is how my variable values are showing in catalog form

How to do this? Do I need to create any other Action