How do you call a function inside a module.exports = function () in another class?

In the following example, simply putting module.exports = {save} on the jsFileName.js file functions is not an option here, due to limitations on my codebase. Is this possible to access the function from the export, inside of callFunctionFromAboveFile.js shown below? See the below example of how I’d like to access that function. I’ve searched all the other answers to questions similar but they all mention using the exports differently as I stated in my first line above.

If there is a way to access it as it is shown, please share your answer or details as to why it’s not possible. Also, other ways to handle this would be helpful but I can’t change the class up much given the limitation to the codebase.

jsFileName.js

module.exports = function (JsFileName) {
    JsFileName.save = function (stuff) {}
}

callFunctionFromAboveFile.js

const JsFileName = require('jsFileName');
// TODO I'm not sure how this would call the save() w/out using exports differently.
// TODO I have to use exports as I've posted it in jsFileName.js