如何在不使用图案的情况下在DateTimeFormatterBuilder中指定区域偏移？

import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.SignStyle;

public class Main {
    public static void main(String[] args) {
        DateTimeFormatter formatter = new DateTimeFormatterBuilder()
                .appendPattern("yyyy-MM-dd HH:mm:ss")
                .appendOffset("+HH:mm", "+00:00")
                .toFormatter();

        OffsetDateTime dateTime = OffsetDateTime.now(ZoneOffset.ofHours(8));
        String formatted = dateTime.format(formatter);
        System.out.println(formatted);
    }
}