Ember Iterating through a promise/ store.findAll return value

In my router I have code let users= this.store.findAll('user')

And my model user.js will be name: DS.attr('string'), userName: DS.attr('string'), company: DS.attr('string')

In my mirage fixture I have User object defined as [{'name':'smith','userName':'smith123'},{'name':'james','userName':'james222'}

And in my router when I do let users= this.store.findAll('user') I want to iterate through users and add company manually for each user. But I am unable to find the way to access the user objects in router js file.

And same object I can iterate in .hbs file. But unable to find the way to iterate it in router js file. Can you please let me know the way to do this.