how to access tracked object offset value in cinemachine
GameObject camObj; //This is your camera with the free look component on it
CinemachineFreeLook freeLook; // this reference the free look component in your camera
//I named this variable comp for "Composer", you can name it however you like. This is the cinemachine component with all the aiming stuff on it
CinemachineComposer comp;
void Start()
{
camObj = GameObject.FindWithTag("MainCamera");
freeLook = camObj.GetComponent<CinemachineFreeLook>();
comp = freeLook.GetRig(1).GetCinemachineComponent<CinemachineComposer>();
// This is how you get to "Tracked Object Offset" of the rig as well as any other property in the rigs.
comp.m_TrackedObjectOffset.y = "your value here";