No, we haver never discussed that as far as I remember. But it is an OK request IMO. But I am not so familiar wiht SN that I know how well-defined “export as JSON’ would be. ‘Export as XML’ is not. Some choices may need to be done.
We have an XML export opton currently (but not very useful due to limitations listed here: https://code.google.com/p/sqlyog/issues/detail?id=716)
I have seen some JSON options added (I think experimentally in the current MySQl 5.7 development tree) . For both XML and JSON we should be compatible with MySQL and tools for same. We will update here after discussion. But it could take a few weeks.