When preparing your game in Unity, you are able to apply the
LunaPlaygroundField attribute to any serializable field (i.e. public fields of MonoBehaviours and ScriptableObjects or fields marked with SerializeField attribute).
This variable will be surfaced in the playable editor in Luna Playground. These fields should be used within your game code so that the default values are overridden when the game is initialised.
You can read more about this here.