gistfile1.txt

in .txt file:

STRUCT ParticleCollisionEvent
  CSRAW
	private Vector3 m_Intersection;
	private Vector3 m_Normal;
	private Vector3 m_Velocity;
	private GameObject m_GameObject;
  // ...
END

somewhere in C++ file, a struct matching memory layout:

struct MonoParticleCollisionEvent {
  Vector3 intersection;
  Vector3 normal;
  Vector3 velocity;
  ScriptingObjectPtr gameObject;
};

This struct is _only_ used in implementation of GetParticleCollisionEvents script API.

int ParticleSystem::GetParticleCollisionsExternal (int instanceId, MonoParticleCollisionEvent* collisionEvents, int size) const
{
   // now here, fill in the destination array, with the game object pointer etc., using ObjectToScriptingObject
}