val properties = FiledOrder::class.declaredMemberProperties
    val parts = properties.partition { it.findAnnotation<FiledOrder.Order>() != null }
    val plain = parts.first.sortedBy { it.name }
    val annotated = parts.second.associateBy { it.findAnnotation<FiledOrder.Order>()!!.value }

value

class FiledOrder {
    @Retention(AnnotationRetention.RUNTIME)
    annotation class Order(val value: Int)