I'm trying to make use of json-ld.net expansion and contraction given the json-ld formatting I'm seeing from major retailers. Are you aware of a discrepancy that follows?

In the repo readme, the example for expansion in the installation uses this example for the json-ld to be expanded:

{"@context":{ "test":"http://www.example.org/"},"test:hello":"world"}

However the major retailers I've looked at have it in something like the following format:

{"@context":"https://schema.org/", "@type":"Product", "image":"https://exampleimage.jpeg/",
"name":"fake product name", "sku":"2345624623", ...}

Is there a way to easily convert this latter format to the format where the context is containing individualized urls for each name/value pair?