How to get a class member of a grandparent class without using get-set?

Can you access and change a class member of a grandparent class without using get-set and Reflect.set?

I tried this code but it doesn’t seem to work:

class Grandparent{
  classMember = null;//Define the class member
  constructor(){
    this.classMember = true;
  }
}

class Parent extends Grandparent{
  constructor(){
    super();
  }
}

class Child extends Parent{
  constructor(){
    super().classMember = false;
  }
}

Is there any way you can do this without tampering with the parent class or grandparent class, or i.e, access and set the class member(s) inside the child class?