How to parametrize file value at collection run

question:
how to parametrize file value at collection run

Details :
i am trying to use postman as data driving testing and i got that need to use collection run to send the data file for below post request , i have parametrized all values at entity key and it works fine but i need away to make the same for content .
i have added column for content at the used csv file include the file file path but it doesn’t work

I’ve already tried:
using prerequisite script but i don’t know how to parametrize src value to read specific value for file path exist at specific column

can some one help to fix this case