Importing Evernote content into Boxnotes or understanding boxnotes json format

I'm leaving Evernote and switching to Box for a number of reasons, but I have several hundred notes that I need to import into Box and I'd prefer to use the Boxnote format.  

I read in another posting that the json format Box uses is internal only, but I'd be willing to write a script to do this, even if it were only to be used this one time.  Does anyone have any details on this format?

Or, is there another method for importing content into boxnotes?

Thanks