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{
  "key1": "a",
  "key2", "b",
  "key3": [
    "c"
  ],
  "key4": "d"
}

When json.config.override exists, the regular merging of arrays does not take place, and only keys specifically mentioned in the override array are replacing the corresponding elements in the parent.

You can find an example of this in the default distribution, where you have gateways as a parent, and gateway1  and gateway2  that as children each reuse the full configuration from the parent, except for the listener  settting which they optionally overrides.