Replication using Datagaurd to FAR DR
Yes it is possible.

Cascaded Redo Transport Destinations


  A cascaded redo transport destination (also known as a terminal
  destination) receives primary database redo indirectly from a standby
  database rather than directly from a primary database.
  
  A physical standby database that cascades primary database redo to one
  or more terminal destinations at the same time it is applying changes
  to its local database files is known as a cascading standby database.


More details at the above URL.