Combine raw data and data files

I am looking for a variable which I can use to have default raw data & Collection data file as well.
What I mean is, I can send regular request with default data & also use same POST for Runner with data file.
We are using below variable for Collection data file but don’t find a way to use one variable for both
“businessName”: {{businessname}}

Can you please help me to find a solution?
Thank you!