Property folding, opposite of nested properties?

[jgonggrijp]

I feel that this question must have been asked before, but I could not find previous instances, let alone answers. This could be a duplicate of #718 but I am not sure; in any case, that question seems to come closest to what I want to ask.

The nested properties feature allows us to write nested objects in the compacted form that disappear in the expanded form. I need the opposite: a way to abbreviate a chain of properties into a single term, so that I can compact a complex linked graph into a flat object. Consider a web annotation, which has a beautiful data model, but which results in nested or linked objects that are difficult to work with in a programming context:

{
    "@context": {
        "@base": "http://example.org/",
        "oa": "http://www.w3.org/ns/oa#",
        "hasBody": { "@id": "oa:hasBody", "@type": "@id" },
        "hasSource": { "@id": "oa:hasSource", "@type": "@id" }
    },
    "@id": "theAnnotation",
    "@type": "oa:Annotation",
    "hasBody": "theBody",
    "oa:hasTarget": {
        "hasSource": "theSource",
        "oa:hasSelector": {
            "@type": "oa:TextPositionSelector",
            "oa:start": 16,
            "oa:end": 25
        }
    }
}

It would be extremely convenient if there was something that would enable me to write this instead:

{
    "@context": "... (whatever goes in here)",
    "@id": "theAnnotation",
    "@type": "oa:Annotation",
    "hasBody": "theBody",
    "hasSource": "theSource",
    "start": 16,
    "end": 25
}

Is there anything in the JSON-LD standards that would help to achieve this? A well-hidden context feature? Framing? I would prefer a context solution if there is one.