Kotlin's data class, Android Room and custom setter

I got an entity for Android Room which looks like that. So far, no worries.

@Entity(tableName = "users",
        indices = arrayOf(Index(value = "nickName", unique = true)))
data class User(@ColumnInfo(name = "nickName") var nickName: String,
                @ColumnInfo(name = "password") var password: String) {

    @ColumnInfo(name = "id")
    @PrimaryKey(autoGenerate = true)
    var id: Long = 0
}

Now I need to encrypt the password. With Java, this would simply be done with a setter and that would work.

How would you do that with Kotlin. I cannot find a solution to combine Android Room, custom setters and data classes.