First of all, CC3D doesn't have RF onboard like Revo class FCs. So you would have to add a telemetry board like OpLink.
Someone else may correct me, but I am 99% sure that CC3D does not do that and won't do it in the future because there isn't room in it for new features.
I think I have heard FrSky telemetry discussed for Revo class FCs, but I don't think it is even available in the development "next" version yet.
If you want battery voltage/current or GPS position / direction home, there are ways of getting it displayed on an FPV OSD, even with CC3D, but for the future, it would be wise to consider buying Revo class FCs. Cheap ones are about $35 shipped or so. That is reasonably close to the cost of CC3D plus telemetry.