compaction

I'm trying to define a context for the following transformation and after
reading and trying, I'm not able to get the result
My source extract
      "http://www.w3.org/2000/01/rdf-schema#label": [
        {
          "@language": "fr",
          "@value": "memoriser"
        },
        {
          "@language": "en",
          "@value": "remember"
        }
      ],

As you can see, it's a part of an OWL ontology transformed in json-ld
I would like to get
"label": [ "fr":  "memoriser", "en": "remember" ],

Perhaps, I've to restart to the begining, but if someone has some help for
me, thank's a lot... as I am new with json-ld


--
Jean-Claude Moissinac