Arbitrary POJO (plain old objects) can be validated. Fzzy Config will automatically wrap any object that implements Walkable, or you can construct validation with ValidatedAny. The validation builds a "mini-config" around the object; anything included within the object will be validated just like a config. Annotations relevant to configs like @IgnoreVisibility work for these objects also.
Warning
An object used in this way needs an empty constructor (doesn't have to be the only constructor, one of them should be empty). It's not strictly necessary in the "game crashes" sense, but it will avoid niche issues that pop up when displaying the object in-game.
See examples of ValidatedAny at Laying out Configs
Heads up!
See the documentation page here 🗗