Serialize array of custom class in custom class

Questions & Answers
1

Hi! I have a problem with my custom class not saving after closing unity/recompiling.

public class HeadClass {
  var eyes : Eye[,];

}

public class Eye {
  var m : Layers[]; 
}

public class Layers{
  var listOfLayers : List<GameObject>;
}

Now, inside a script, the HeadClass class is saved:

@SerializeField
var allHeads : List.<HeadClass>;

But the remaining classes inside the HeadClass are not. I think they are not beeing serialized, but I dont know how to make this work. Can i serialize those classes somehow?
EDIT:
and i tried to use serialise (docs) on my custom class, but that also doesn’t work:

@script Serializable
public class Eye {
  var m : Layers[]; 
}

gives me an error.

2

To the class Eye be serialized, all this properties also need to be serializable and Layers are not.