Nested objects in translation files

[kahurangitama]

Hi there!
Normally people have translations file like:

{
  "Form.Login.Input.Label": "...",
  "Form.Login.Input.Placeholder": "..."
}

but the part "Form.Login.Input" is duplicated each time we need to group translations logically.
To avoid this duplication I decided to have just an object (not plain) as my translation file structure like:

{
  "Common": {
    "Button": {
      "AddStep": "add step",
      "Back": "Back",
      "Continue": "Continue",
      "Create": "Create",
      "Delete": "Delete",
      "Edit": "Edit",
      "Order": "Order",
      "Save": "Save",
      "Submit": "Submit",
      "Update": "Update"
    }
  },
  "Form": {
    "Address": {
      "Header": {
        "Address": "Delivery address",
        "Contact": "Contact details"
      },
      "Label": {
        "Apartment": "Apartment",
        "Building": "Building",
        "City": "City",
        "Country": "Country",
        "Entrance": "Entrance",
        "Floor": "Floor",
        "Name": "Name",
        "Phone": "Phone",
        "Street": "Street"
      }
    },
  ........

I just stumbled upon this plugin, install it as it described and got all my keys deleted:

> node ./translationRunner.js

Duplicate ids:
 
  No duplicate ids found, great!
 
Maintaining en.json:
 
Deleted keys:
  Common: [object Object]
  Data: [object Object]
  Form: [object Object]
  Layout: [object Object]
  Modal: [object Object]
  Units: [object Object]
  View: [object Object]

My suggestion that is this plugin works only with plain translation files? If I wrong, could you point me, how to configure the script correctly?