For farfield, please refer those articles:
https://optics.ansys.com/hc/en-us/articles/360037228834-Lumerical-scripting-language-By-category
https://optics.ansys.com/hc/en-us/articles/360034914733-Simple-far-field-projection-example
https://optics.ansys.com/hc/en-us/articles/360034914713-Far-field-projections-in-FDTD-overview
https://optics.ansys.com/hc/en-us/articles/360034394334-Creating-line-plots-of-far-field-projections