There's currently no example for this, since the SW stack required to support peer to peer communication is non-trivial.
If you require this, the best bet is simply to dig into the datasheet, and start to understand how the data frames work, what the different modes are for the chip, and really familiarize yourself with NFC. Libnfc is still a good starting point for this since their code is reasonably well structured, and they have an example (I believe) of emulating a tag with the PN532 that you may be able to translate over the the Arduino.
The Adafruit library may (and probably will) get extended in the future, but we really can't promise any specific functionality or dates, simply because the amount of SW effort that goes into boards like this can be substantial. P2P and tag emulation has always been on the todo list, the difficulty is always just finding the time to real bite into that since it requires a fair amount of concentration and effort to do properly.