Half Power Beam Width

Hello there! I'm looking for a way to extract the Half Power Beam Width of my antenna array. I want to extract it as an output value, in degrees or radians unit. I need to do this because I have the intention to use the optimizer to get a Half Power Beam Width of 90 degrees, (-45-45).

As you know the Half Power Beam Width depends on the amplitudes of the sources and the spacing between antenna elements.

Does somebody know if that is possible using sim4life?