How to use Quaternion.RotateTowards and Quaternion.LookRotation only on the Y rotation ?

Unity Engine
,
1 
private void FixedUpdate()
    {
        if(startRotating)
        {
                transform.rotation = Quaternion.RotateTowards(transform.rotation,
     Quaternion.LookRotation(camfreelook.transform.position - transform.position),
     rotationSpeed * Time.deltaTime);
            
        }
     }

The problem is that the transform rotate also on the X and i want it to be rotating only on the Y.

2

Usually you just flatten the delta vector before using it, eg set the y to zero.