Variable interpolation in POST requests

Hi,

I am testing a PST request which requires a raw string to be posted. I
created a file with the content that I'd like to be posted and it works
well. However I'd like to take an extra step and parametrize the content of
the requests with ${} variables that comes from a CSV data set. Is there any
way to get their values interpolated in that file?

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Sincerely yours,
Nadav