Pixhawk 5v rssi

I have a pixhawk coming in and was searching were do we have a 5v input for RSSI measurements on the pixhawk and how to connect it?
And is it supported with the 3.1 rc1 fimrware?

There is another thread on this, no developers have chimed in yet, but it seems like it isn’t working yet. there is a port for an RSSI signal, but MP isnt reading it maybe? If you get it figured out please let us know!

RSSI in is not implemented on the Pixhawk yet.

This was 6 months ago, Has RSSI been implemented on the Pixhawk yet? If so, which pin is it on?