In my (non-TeXlive) ConTeXt installation, I've found the file:

$HOME/context/tex/texmf-context/tex/context/base/mkiv/util-jsn.lua

and added the changes you mentioned (so the end of the file now is):

package.loaded["util-jsn"] = json
package.loaded.json        = json

return json

(around the line 460)

and I ran context --make

But I am still getting the same error.

Are these steps correct, or did I miss anything? I am not familiar with ConTeXt 
codebase (or not well enough) ... Thank you for guiding me through this!
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