iTween gradual jump 2D

Hello everyone. I'm trying to make my player jump gradually while the button is pressed, but without success. Could someone give some idea of ​​how to do? ITween use to make the player move through a path. The player has a rigidbody2d with isKinematic enabled and a gameobject child who has a renderer sprite

 if (!jumping && Input.GetMouseButton(0)) {
        StartCoroutine (Jump());
    }
    
        IEnumerator  Jump (){        
            jumping = true;
            float timer = 0.0f;
            
            while (timer <= jumpTime) {
                float height = Mathf.Sin(timer / jumpTime * Mathf.PI) * jumpHeight;
                transform.localPosition = new Vector3(transform.localPosition.x, transform.localPosition.y+height, 0);
                timer += Time.deltaTime;
                
                yield return null;
            }
            jumping = false;
        }