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;
      }