OWL serialization

Hello all,
i`m starting to develop using JSON-ld, and i have a question.
I`m trying to serialize owl-dl files in json-ld (i saw a related project
but i want to do this for my own :P)

*For example, i'm trying to serialize pizza owl ontology (only the owl-dl
description of ontology, without axioms)* ( http://pastebin.com/Y1hyZaJj ) :

{
    "@context": {
        "pizza": {
            "@id": "http://130.88.198.11/co-ode-files/ontologies/pizza.owl",
            "@type": "@id"
        },
        "rdf": "http: //www.w3.org/1999/02/22-rdf-syntax-ns#",
        "xsd": "http: //www.w3.org/2001/XMLSchema#",
        "rdfs": "http: //www.w3.org/2000/01/rdf-schema#",
        "owl": "http: //www.w3.org/2002/07/owl#"
    },
    "owl: Ontology": {
        "rdf: about": "",
        "owl: versionInfo": [
            {
                "info":
"v.1.4.AddedFoodclass(usedindomain/rangeofhasIngredient
AddedseveralhasCountryOfOriginrestrictionsonpizzas
MadehasToppinginversfunctional",
                "@language": "en"
            },
            {
                "info":
"v.1.5.Removedprotege.owlimportandreferences.MadeontologyURIdate-independent",
                "@language": "en"
            }
        ],
        "rdfs:comment": {
            "info":
"AnexampleontologythatcontainsallconstructsrequiredforthevariousversionsofthePizzaTutorialrunbyManchesterUniversity(seehttp:
//www.co-ode.org/resources/tutorials/)",
            "@language": "en"
        }
    }
}

*This is valid to JSON validators, but i've tested in json-ld playground,
and i got this (expanded):*
[
  {
    "http: //www.w3.org/2002/07/owl# Ontology": [
      {
        "http: //www.w3.org/2002/07/owl# versionInfo": [],
        "http: //www.w3.org/1999/02/22-rdf-syntax-ns# about": [
          {
            "@value": ""
          }
        ]
      }
    ]
  }
]

Anyone can help me to find why it don't show info and language information
about info and language in comment and version info ?

Thanks,
Vinícius Maran