How can I assign an Array of Vector3 while seeing and editing the values in the Scene?

I wanted to have a clean and simple way to have a List or Vecto3[] inside my script and the property being editted in the inspector while appearing (to easily see it) on the scene when selecting the object. It would be easier to edit it in scene to set the path of an object.

I've already tried this approach: https://gist.github.com/ProGM/226204b2a7f99998d84d755ffa1fb39a Sadly it only works for Vector3 properties, not a List or an Array.

Does anyone know how to do it?