This feature is not supported whatever the radio or firmware.If you want telemetry back to ground you should use Oplink.
Yes, if you set one of the cc3d serial ports to telemetry it will output in the project's telemetry format, uavtalk.It's documented at https://librepilot.atlassian.net/wiki/display/LPDOC/UavTalk#UavTalk-TheUAVTalkProtocoland you're welcome to look at the source code of the project's version of minOPOSD at https://bitbucket.org/f5soh/minoposd as a sample of how to parse it.You can either put some board like an arduino mini on the aircraft to process the telemetry stream or a pair of oplink-mini modems understand the protocol and will transfer the data from the aircraft to the ground and you can parse it there. Either way you'd have to write software to parse the UavTalk into whatever format you need. The parser in the minOPOSD is written to be compiled by the Arduino development software so it would be a good starting point.