How to handle dynamic value which is not in source code in NeoLoad

Hi,
I have to extract a dynamic value which is not there in any previous request responses as general, but there is a request like "load.min.js". The request response looks like
function() {
var e = [];
e.push("AWS4-ABCD-EFGH"),
e.push(this.dateString),
e.push(this.String()),
e.push(r.(this.Request()));
var n = e.in("\n");
return t.d("stringToSign:", n),

In the above code, "stringToSign" is dynamic. I want extract value of "stringToSign" from response and I have to pass in the next request. Please help in this to get the dynamic value.