Are property-scoped contexts allowed for nested properties in JSON-LD 1.1?

Dear all,

Is it by design, or by some limitation in the algorithm (which may still be
rephrased?), that nested properties cannot have property-scoped contexts in
JSON-LD 1.1?

It seems that neither the JSON-LD 1.1 Playground nor Gregg's distiller
supports this (i.e. the property-scoped contexts in the nest properties
have no effect on the expansion):

- - - 8< - - -

{
  "@context": {
    "@vocab": "http://purl.org/dc/terms/",
    "bibo": "http://purl.org/ontology/bibo/",
    "@version": 1.1,
    "Print": "bibo:Book",
    "name": "http://www.w3.org/2000/01/rdf-schema#label",
    "instanceOf": "@nest",
    "contributionByRole": {
      "@id": "@nest",
      "@context": {
        "agent": "@nest",
        "aut": "creator"
      }
    },
    "provisionActivityByType": {
      "@id": "@nest",
      "@context": {
        "Publication": {
          "@id": "@nest",
          "@context": {"date": "published", "agent": "publisher"}
        }
      }
    },
    "identifiedByType": {
      "@id": "@nest",
      "@context": {
        "Isbn": {"@id": "@nest"},
        "value": "bibo:isbn"
      }
    }
  }
,  "@id": "book/one",
  "@type": "Print",
  "instanceOf": {
    "contributionByRole": {
      "aut": {
        "agent": {"name": "Some Body"}
      }
    }
  },
  "identifiedByType": {
    "Isbn": {
      "value": "1234567890"
    }
  },
  "provisionActivityByType": {
    "Publication": {
      "date": "1999",
      "agent": {"name": "PubCorp"}
    }
  }
}

- - - >8 - - -

I am attempting a "neat trick" here, by compacting BibFrame data into maps
(see [2]), and then *swapping out* the context with another one mapping to
DC+BIBO, as per the context snippet above, using nests with local contexts
to treat the same JSON semantically differently.

I'm pursuing multiple venues here, I just hoped that this "poor man's
inference trick" might prove fruitful. Also, in general, it might be
beneficial to consider (in the WG) whether this limitation on nests is by
design or simply an oversight. I know of the feature freeze, it's just not
obvious to me whether the Syntax prohibits this or if the algorithm in the
API spec misses an opportunity.

Best regards,
Niklas

PS. After a prolonged hiatus, I'm happy to have *finally* spent some
quality time with the JSON-LD 1.1 spec, mainly by working on an expansion
implementation for rdflib_jsonld [3] (currently passing about 80% of the
toRdf specs).

[1]:
https://json-ld.org/playground/#startTab=tab-compacted&json-ld=%7B%22%40context%22%3A%7B%22%40vocab%22%3A%22http%3A%2F%2Fpurl.org%2Fdc%2Fterms%2F%22%2C%22bibo%22%3A%22http%3A%2F%2Fpurl.org%2Fontology%2Fbibo%2F%22%2C%22%40version%22%3A1.1%2C%22Print%22%3A%22bibo%3ABook%22%2C%22name%22%3A%22http%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23label%22%2C%22instanceOf%22%3A%22%40nest%22%2C%22contributionByRole%22%3A%7B%22%40id%22%3A%22%40nest%22%2C%22%40context%22%3A%7B%22agent%22%3A%22%40nest%22%2C%22aut%22%3A%22creator%22%7D%7D%2C%22provisionActivityByType%22%3A%7B%22%40id%22%3A%22%40nest%22%2C%22%40context%22%3A%7B%22Publication%22%3A%7B%22%40id%22%3A%22%40nest%22%2C%22%40context%22%3A%7B%22date%22%3A%22published%22%2C%22agent%22%3A%22publisher%22%7D%7D%7D%7D%2C%22identifiedByType%22%3A%7B%22%40id%22%3A%22%40nest%22%2C%22%40context%22%3A%7B%22Isbn%22%3A%7B%22%40id%22%3A%22%40nest%22%7D%2C%22value%22%3A%22bibo%3Aisbn%22%7D%7D%7D%2C%22%40id%22%3A%22book%2Fone%22%2C%22%40type%22%3A%22Print%22%2C%22instanceOf%22%3A%7B%22contributionByRole%22%3A%7B%22aut%22%3A%7B%22agent%22%3A%7B%22name%22%3A%22Some%20Body%22%7D%7D%7D%7D%2C%22identifiedByType%22%3A%7B%22Isbn%22%3A%7B%22value%22%3A%221234567890%22%7D%7D%2C%22provisionActivityByType%22%3A%7B%22Publication%22%3A%7B%22date%22%3A%221999%22%2C%22agent%22%3A%7B%22name%22%3A%22PubCorp%22%7D%7D%7D%7D&context=%7B%22%40context%22%3A%7B%22%40vocab%22%3A%22http%3A%2F%2Fpurl.org%2Fdc%2Fterms%2F%22%2C%22bibo%22%3A%22http%3A%2F%2Fpurl.org%2Fontology%2Fbibo%2F%22%2C%22name%22%3A%22http%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23label%22%7D%7D

[2]:
https://json-ld.org/playground/#startTab=tab-compacted&json-ld=%7B%22%40context%22%3A%7B%22%40vocab%22%3A%22http%3A%2F%2Fpurl.org%2Fdc%2Fterms%2F%22%2C%22bibo%22%3A%22http%3A%2F%2Fpurl.org%2Fontology%2Fbibo%2F%22%2C%22%40version%22%3A1.1%2C%22Print%22%3A%22bibo%3ABook%22%2C%22name%22%3A%22http%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23label%22%2C%22instanceOf%22%3A%22%40nest%22%2C%22contributionByRole%22%3A%7B%22%40id%22%3A%22%40nest%22%2C%22%40context%22%3A%7B%22agent%22%3A%22%40nest%22%2C%22aut%22%3A%22creator%22%7D%7D%2C%22provisionActivityByType%22%3A%7B%22%40id%22%3A%22%40nest%22%2C%22%40context%22%3A%7B%22Publication%22%3A%7B%22%40id%22%3A%22%40nest%22%2C%22%40context%22%3A%7B%22date%22%3A%22published%22%2C%22agent%22%3A%22publisher%22%7D%7D%7D%7D%2C%22identifiedByType%22%3A%7B%22%40id%22%3A%22%40nest%22%2C%22%40context%22%3A%7B%22Isbn%22%3A%7B%22%40id%22%3A%22%40nest%22%7D%2C%22value%22%3A%22bibo%3Aisbn%22%7D%7D%7D%2C%22%40id%22%3A%22book%2Fone%22%2C%22%40type%22%3A%22Print%22%2C%22instanceOf%22%3A%7B%22contributionByRole%22%3A%7B%22aut%22%3A%7B%22agent%22%3A%7B%22name%22%3A%22Some%20Body%22%7D%7D%7D%7D%2C%22identifiedByType%22%3A%7B%22Isbn%22%3A%7B%22value%22%3A%221234567890%22%7D%7D%2C%22provisionActivityByType%22%3A%7B%22Publication%22%3A%7B%22date%22%3A%221999%22%2C%22agent%22%3A%7B%22name%22%3A%22PubCorp%22%7D%7D%7D%7D&context=%7B%22%40context%22%3A%7B%22%40vocab%22%3A%22http%3A%2F%2Fpurl.org%2Fdc%2Fterms%2F%22%2C%22bibo%22%3A%22http%3A%2F%2Fpurl.org%2Fontology%2Fbibo%2F%22%2C%22name%22%3A%22http%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23label%22%7D%7D

[3]: https://github.com/RDFLib/rdflib-jsonld/pull/74