The package might do a great job -- I hope so, with this huge artillery! I know and have worked with both subjects -- SQL and JSON -- in PHP, and I believe that the conversion could be done in a single PHP file with one or more PHP classes. I Have already submitted such a package (MDB to DB). It takes a single PHP file.
I have not installed the package, so I can't judge its quality. I forbid myself to install a package of 55 files (!) for just a conversion/exporting of SQL to JSON.