How do I read JSON from file (Flowgraph)

I want to make a mission that loads JSON from a file to see all the different vehicles and locations that are in the file.
Example json file:

Code:

{"vehicles":["vehicles/gfdgdf.pc","another vehicle","another vehicle.pc"],"locations":[[200,100,200],[100,200,100]]}

And also, how do I make a Lua mission?