Zilla Slab / 400
{
  "copyright": {
    "en": "Copyright 2017, The Mozilla Foundation"
  },
  "license": {
    "en": "Licensed under the Open Font License, version 1.1 or later."
  },
  "licenseURL": {
    "en": "http://scripts.sil.org/OFL"
  }
}

Zilla Slab / 600
{
  "copyright": {
    "en": "Copyright 2017, The Mozilla Foundation"
  },
  "license": {
    "en": "Licensed under the Open Font License, version 1.1 or later."
  },
  "licenseURL": {
    "en": "http://scripts.sil.org/OFL"
  }
}

Zilla Slab / 700
{
  "copyright": {
    "en": "Copyright 2017, The Mozilla Foundation"
  },
  "license": {
    "en": "Licensed under the Open Font License, version 1.1 or later."
  },
  "licenseURL": {
    "en": "http://scripts.sil.org/OFL"
  }
}