Auto.js

// Use Proxy object and handler to create a new property on the fly
let Auto = () =>
 
  // Proxy() object of JavaScript
  new Proxy({}, {

    // Handler checks if prop exits
    // otherwise, creates it
    get: (obj, prop) => 
      prop in obj 
        ? obj[prop] 
        : obj[prop] = Auto()
    }
  )

// Create only TOP level
let univ = Auto();

// Now assign to deeper level
univ.college.stream.year = "A+";

// Bingo! It works
console.log(univ);