Entity_Chicken: {
    type: "compound";
    value: {
        entries?: {
            type: "list";
            value: {
                type: "compound";
                value: {
                    SpawnTimer: { type: "int"; value: number };
                    StopSpawning: { type: "byte"; value: number };
                }[];
            };
        };
    };
} & ActorPrefix & Component_Ageable

Additional fields for chicken.