How do I make child classes in a list editable from the Inspector?

I just can't seem to find the answer to this.

If I have:

     [Serializable]
     public class Parent
     {
        public string parentString;
     }
     
     [Serializable]
     public class Child : Parent
     {
        public string childString;
     }
     
     public class MonoClass : MonoBehavior
     {
        public List<Parent> myList;
     }

and my MonoClass is attached to a gameobject in the scene. How do I edit values from the child class in the list? (i.e. the childString var)

How do I make Unity serialize the child variables in a parent list?

Any help is much appreciated. This information actually seems to be unavailable from the internet (or I've just tried that hard looking for it and failed miserably).