Feature request: just-in-time binding resolution through SPI

Let's imagine that I wish to inject some values which cannot be provided to injector ahead of time. For example, I wish to provide a complex DTO based on my config values:

```
class Something @Inject() (@ConfigValue("x.y.z") value: MyValue) {...}
```

Right now I have no any sane way to do that as far as I can understand.

Though in some situations such functionality would be priceless.