Any way to get `constantValue`?

Is there any equivalent API for the `VariableElement.getConstantValue()` method from Java annotation processing?

If no, is there any suggested workaround or timeframe when KSP will support it?

For example from this source code, I'm looking to obtain the "my_string" string:
```
object MyClass {
const val STR = "my_string"
}
```