"ff_radiation_plot" analysis group has converted the rectilinear dataset in FDTD to unstructured data for display of 3D radiation, and I did not find any simple script command to do the angular integration, other than
https://optics.ansys.com/hc/en-us/articles/360034926633-quadtet
The output of the dataset Efar does not have ux,uy and uz associated.
You can modify the script inside the analysis group, and do only forward projection, with given ux,uy and uz and convert them to theta and phi, and then get the xyz on the 1m semishere. After projection the result should be a function of ux and uy, and then you can follow the regular farfield integration.
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