Set Environment Var to response body

[EdKing1375]

Hi I am trying to set an environment var to a response body. The response body doesn't have any properties is it simply a string I was wondering how I can use Json query to just pull the response body's value. and example response is
{
"1234abcdefg"
}

[rangav]

Hi @EdKing1375

Please following instructions in below link and image
https://github.com/rangav/thunder-client-support#setenv

[kshah-me]

Is there anyway to create variable on collection level ?
what I am looking for, Variable will be created once on collection level and value without change will be used into all test cases under collection ?
Note:- we don;t want to use any external files