I managed to find some old information regarding this topic. Sadly there is no info about training jump shot for wingmen option.
I dont need exact numbers, just confirmation that training has 100% efficiency (not 90%) and skills that my players would improve with training jump shot (wingmen).
Jump Shot
Guards:
Trains JS @ 2-3 weeks
Trains JR @ 7-8 weeks
Trains HN @ 7-8 weeks
Trains DV @ 7-8 weeks
Forwards:
Trains JS @ 2-3 weeks
Trains JR @ 7-8 weeks
Trains IS @ 7-8 weeks