Injecting nested state value to a behavior

How do you inject nested state value to a behavior? (ex: `$states.get([‘a’, ‘b’]` from `{states: { a: { b: 1 } } }`)

@Imti on Slack:

> We don't have a good way to do that yet. You'll have to inject `a` and reach into `b` to use it from within a behavior

@matthewtoast on Slack:

> i would advise sticking to the flattened states for now