What is the way to create DAO entity with a pre-defined value for a foreign key reference?

For instance, here's a sample from readme:

```kotlin
class User(id: EntityID) : IntEntity(id) {
companion object : IntEntityClass(Users)

var name by Users.name
var city by City referencedOn Users.city
var age by Users.age
}
```

Suppose I know `id` for `"St. Petersburg"` city is 42.
How could I create a user without loading the city?

```kotlin
User.new {
name = "a"
city = 42 // <-- ??? is there a way to specify the value without loading the city first?
age = 5
}
```