Converting a blank node from JSON-LD (test.json) -> XML/RDF (test.xml) -> JSON-LD (test_back.json) and Turtle (test_back.ttl)

test.json

{
    "@context": {
        "obo": "http://purl.obolibrary.org/obo/",

        "denotes": {
            "@id": "obo:IAO_0000219",
            "@type": "@id"
        }
    },

    "denotes": {
        "denotes": "http://purl.obolibrary.org/obo/UBERON_0010527"
    }
}

test.xml

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF
   xmlns:obo="http://purl.obolibrary.org/obo/"
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>
  <rdf:Description rdf:nodeID="Nd04b5f2fcd1a4241af5019f8883442ee">
    <obo:IAO_0000219 rdf:nodeID="N3a8bb397738a43528e5da0d128ff1a57"/>
  </rdf:Description>
  <rdf:Description rdf:nodeID="N3a8bb397738a43528e5da0d128ff1a57">
    <obo:IAO_0000219 rdf:resource="http://purl.obolibrary.org/obo/UBERON_0010527"/>
  </rdf:Description>
</rdf:RDF>

test_back.json

[
  {
    "@graph": [
      {
        "@id": "_:Ne2dbbb06747c4562b0b42ebccca3b79a",
        "http://purl.obolibrary.org/obo/IAO_0000219": [
          {
            "@id": "_:N69b76b9cf976489a8b98cbd95abec4af"
          }
        ]
      },
      {
        "@id": "_:N69b76b9cf976489a8b98cbd95abec4af",
        "http://purl.obolibrary.org/obo/IAO_0000219": [
          {
            "@id": "http://purl.obolibrary.org/obo/UBERON_0010527"
          }
        ]
      }
    ],
    "@id": "file:///C:/Users/Gaurav/code/nexml2jsonld/test.xml"
  }
]

test_back.ttl

@prefix obo: <http://purl.obolibrary.org/obo/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xml: <http://www.w3.org/XML/1998/namespace> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

[] obo:IAO_0000219 [ obo:IAO_0000219 obo:UBERON_0010527 ] .