Jooq: jsonb fetchInto custom type

what's the correct way to map jsonb record into custom data type? just like normal table fields.

create table t_order
(
    id    serial
        constraint t_order_pk
            primary key,
    key   varchar(255) not null,
    value jsonb        not null
);

create unique index t_order_id_uindex
    on t_order (id);

create index t_order_value_index
    on t_order using gin (value);

@Data
@Builder
class Order {

  private List<OrderItem> orderItems;

  @Data
  @Builder
  public static class OrderItem {

    private BigDecimal price;
    private BigDecimal quantity;
  }
}

@Test
  void findOrderById() {
    var order =
        dsl.select(T_ORDER.VALUE)
            .from(T_ORDER)
            .where(T_ORDER.ID.eq(1))
            .fetchOptionalInto(Order.class); // OOPS!
    assertTrue(order.isPresent());
    log.info(order);
}