No, there is no inverse function yet. I use it to write audit logs that only need to be human readable. The JKI JSON library and LabVIEW's JSON and XML tools do support an inverse function. For reading and writing to disk, I use OpenG's Variant Configuration File library. It's great for storing and recalling configuration parameters for your software, and the file is easily viewed and edited in any text editor.
BTW, I intend to update the Variant to Legible String VI at some point with support for ISO8601 timezones, complex numbers and perhaps basic support for units - but that's a tricky one.
