Hi, though I am new user of PI 3 after reading your question I thought may be I could give you some hints.
In the library of emitters_05_06.il3 Emitter name:Electric glow 1 and 2 in the folder Inspired by Dan Wilcox I guess you can use.
I have just experimented and made a movie and uploaded on creative cow. If this is the type you are interested in then I can tell how to do that.
Oh I do not know how to add link of my video here I am a dead duck??? I' ll try. Any way the title of my video if someone can locate Electric effects on tree.