Pew pew pew. It has been done. I wrote actions for this asset:
https://www.assetstore.unity3d.com/en/#!/content/47750Ballistic Projectile Helper, 5$.
Helpful C# library to deal with 3D ballistic math calculations. Great for any project involving ballistic projectiles and trajectories.
My actions as always are free. You can download them from my github. There is 1 action for each of the functions (methods) in this package. Ie, it covers it all.
https://github.com/dumbgamedev/projectileHelper-playmakerI also write a few stand alone actions that can help to calculate position to position projectiles and then shoot them (on any axis or height). I will make a tutorial on that and post it soon as well.