Notwithstanding the technical barriers to porting FAA radar data into a classified, encrypted JTIDS network (that isn't even a stable, enduring network when outside of a combat zone, but instead an ad-hoc network between aircraft that happen to be airborne at the same time and not connected to anything on the ground)...

Surveillance radar returns are not high enough fidelity to provide reliable 3-dimensional cues for display in a helmet. It is only AI radars, with faster scan rates and the ability to single-target-track, that provide track data good enough to create a "TD container".