The JSON-LD 1.1 draft spec mentions different levels of processing for JSON-LD: https://w3c.github.io/json-ld-syntax/#processor-levels

A pure processor can only parse JSON-LD expressed in JSON directly, but a full processor can also parse JSON-LD embedded in HTML.

It would be great if rdflib-jsonld would support this. It would make rdflib-jsonld a library that could be used for HTML documents following the schema.org guidelines for embedding (meta)data in HTML pages as described in their getting started guide https://schema.org/docs/gs.html.

Together with the RDFa & microdata parsers this can then work as a fully RDF based version of the Structured Data Testing tool from Google: https://search.google.com/structured-data/testing-tool.