How to transfer data to/from method argument to self in Bytebuddy?

I have a base class

public abstract class Cache {
    public abstract void load(Object input);
    public abstract void dump(Object output);
}

Would like to subclass it in Bytebuddy and

1. define a certain number of fields (This I am able to do)
2. implement to 2 abstract methods:

• for load, get value from its fields and set the corresponding field (of the same name) in the Cache object
• for dump, get value from the Cache object and dump it into object

Tried FieldAccessor but seems the API isn't suited for this purpose? Couldn't find any solution online except for this ancient answer which is supposedly addressed but I can't find the corresponding code How to get the value from each field of a class with Byte Buddy?

Example

public class Input {
   double foo;
   String bar;
}
public class Output {
   boolean z;
}

Based on this supplied classes (Input & Output), extend/implement a Cache class with bytebuddy such that it does the following

public class ByteBuddyCache extends Cache {

    double foo;
    String bar;
    boolean z;

    public void load(Object input) {
        Input i = (Input) input;
        this.foo = i.foo;
        this.bar = i.bar;
    }
    public void dump(Object output) {
        Output o = (Output) output;
        o.z = this.z;
    }
}

This would require you to create custom StackManipulations. In these, you would combine FieldAccess objects and MethodVariableAccess.