Extended Radar Target blocks

I am trying to obtain the Range doppler map for a human being in MATLAB, using a complete system based simulation for FMCW radar.

However, the phased.RadarTarget block only acts as a point target. I am looking for something like an extended target (sphere, ellipsoid etc) to mimic the human cadence. Can someone guide me which app, toolbox I can use for this.

Thanks!