How to get environment variable in mongo shell?

Question

I am trying to load a file from folder;

I have a system environment variable as follows

HOME="/home/stack/FolderName"

How can I get this path in js file

$mongo databasename  script.js

in script file

 var data = cat(env.getPath("HOME") +"/requiredData.csv")
 var arr = data.split(",");
 arr.forEach((a) =>  db.collection.insert(a))

data in requireddata.csv is as follows a,b,c,d

thanks in advance.