JSON RW in V2.0 APIs

I’m using couchbase.Lite.net in UWP.
The question is that can we directly save and get JSON strings in document instead of Dictionary < string , object > Which converts to JSON by library ?

No, that is not a supported feature of the library because actually the storage format is not JSON strings but a compressed binary format so in order to support JSON strings we would have to first parse the JSON string to a JSON object anyway.