How can terms in a JSON-LD context compact OWL NamedIndividuals to JavaScript objects? - protege

Question

An expanded JSON-LD file was saved from Protege and I would like to write a context that compacts the JSON-LD such that the NamedIndividuals become Javascript objects. My JSON-LD file provides orbital parameters for planets.
I attempted to define "earth" as a term but it did not have the desired effect of replacing the #id and #type. What I'd like is a compact JSON-LD file that I can parse into an object and access parameter values with something similar to mars.inclination, or graph[i].inclination. Guidance and examples would be appreciated. Thanks.
Here is a portion yet complete JSON-LD file with the context I developed in JSON-LD Playground:
{
"#context": {
"demo": "http://example.org/demo#",
"decimal": "http://www.w3.org/2001/XMLSchema#decimal",
"owl": "http://www.w3.org/2002/07/owl#",
"label": "http://www.w3.org/2000/01/rdf-schema#label",
"comment": "http://www.w3.org/2000/01/rdf-schema#comment",
"eccentricity": {
"#id": "demo:eccentricity",
"#type": "decimal"
},
"inclination": {
"#id": "demo:inclination",
"#type": "decimal"
},
"omega": {
"#id": "demo:omega",
"#type": "decimal"
},
"sma": {
"#id": "demo:sma",
"#type": "decimal"
},
"raan": {
"#id": "demo:raan",
"#type": "decimal"
},
"tau": {
"#id": "demo:tau",
"#type": "decimal"
},
"period": {
"#id": "demo:period",
"#type": "decimal"
},
"earth": {
"#id": "demo:Earth",
"#type": "owl:namedIndividual"
}
},
"#graph": [
{
"#id": "demo:Earth",
"#type": [
"owl:NamedIndividual",
"demo:Orbit"
],
"eccentricity": "0.016708",
"inclination": "7.155",
"omega": "-11.26064",
"period": "365.256363",
"raan": "23.4392811",
"sma": "1",
"tau": "114.20783",
"label": "Earth"
},
{
"#id": "demo:Mars",
"#type": [
"owl:NamedIndividual",
"demo:Orbit"
],
"eccentricity": "0.0934",
"inclination": "5.65",
"omega": "49.558",
"period": "686.971",
"raan": "317.68143",
"sma": "1.523679",
"tau": "286.502",
"label": "Mars"
},
{
"#id": "demo:Mercury",
"#type": [
"owl:NamedIndividual",
"demo:Orbit"
],
"eccentricity": "0.20563",
"inclination": "3.38",
"omega": "48.331",
"period": "88",
"raan": "281.01",
"sma": "0.387098",
"tau": "29.124",
"label": "Mercury"
},
{
"#id": "demo:Orbit",
"#type": "owl:Class"
}
]
}