Allow access to certain fields of document

I am trying to figure out if it is possible to share only certain fields of document with users?
Lets assume we have a document:

   "address":"Some city and Street",

I want to share this document with some users, but ‘hide’ field address.


That’s not currently possible.

The general approach for public and private data is to have these in separate documents with separate channels for finer grained access control.