Reading json file

how do I read?

Json:

      {
         "data":[[1.0, 1.5,2.0],[4.0, 4.5, 5.0]]
      }

C#:

      public class test : MonoBehaviour {
      
       string path;
       string jsonString;

       void Start () {
        path = Application.streamingAssetsPath + "/acadunity.json";
        jsonString = File.ReadAllText(path);
        Creature Lines = JsonUtility.FromJson<Creature>(jsonString);
        print(Lines.data[0]);
       }
      }
      [Serializable]
      public class Creature{
       public int[] data;
      }

ERROR!!!

Try this :

[Serializable]
public class Creature
{
    public Vector3 [] data;
}