Key 'constructor' is not parsed

[coolalex12]

<div>
  {{ 'constructor.test1' | translate }}
</div>
<div>
  {{ 'test' | translate }}
</div>

parse results:

{
  "test": ""
}

expected result

{
  "constructor": {
    "test1": ""
  },
  "test": ""
}

[SebaRenner]

@coolalex12 did you use the correct format option?
--format namespaced-json

Test it as well. Seems like constructor is a keyword that is crawled but ignored