reading json file in Vector

My json:

1. {
2. "lines":[[1.0,0.0,0.0],[5.0,0.0,0.0]
3. ]}

my C# code:

1. string path;
2. string jsonString;
3. 
   
4. void Start () {
5. path = Application.streamingAssetsPath + "/acadunity.json";
6. jsonString = File.ReadAllText(path);
7. Creature Lines = JsonUtility.FromJson<Creature>(jsonString);
8. Debug.Log(Lines.lines[0]);
9. 
   
10. [Serializable]
11. public class Creature{
12. public Vector3[] lines;
13. }

I get:

1. (0.0, 0.0, 0.0)

I want to get:

1. [1.0,0.0,0.0]