the current descriptions provide means to specify encoding and framing options through a programmatic api. these include the context to apply, whether to frame the result.
they also provide means in http headers to specify the variant which applies to the given document in terms of a link to a context and/or a media type profile.

the 1.0 descriptions do not appear to provide a way to specify that same information to a json-ld source as part of an http request.
is this now included somewhere in 1.1 document?
are there plans to provide for this?