Set Body-File via Pre-Request-Script?

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To Idea/Approach2, here the code (to give a example what doesnt work)_

var request = JSON.parse(responseBody); 
var resultCount = request.resultsCount;

var result1 = ""; 
var result2 = ""; 
var result3 = "";

if (resultCount > 0)
{ 
var result1 = ", " + request.result[0].description; } 

if (resultCount > 1)
{ var result2 = request.result[1].description; } 

if (resultCount > 2) 
{ var result3 = ", ..."; }

pm.test("We got " + resultCount + " results" + result1 +", "+ result2 +""+ result3, function () { 
pm.expect(request.resultsCount).to.be.gt(0);

-> result: “We got undefined results”. So he acts like he doesnt recognize the variables i let him create during the testcases…