how to modify MarkLine color about go-echarts HOT 1 OPEN

type MyItem struct {
	Name           string `json:"name"`
	YAxia          int    `json:"yAxia"`
	opts.LineStyle `json:"lineStyle"`
}

func barMarkLines() *charts.Bar {
	bar := charts.NewBar()
	bar.SetSeriesOptions(charts.WithSeriesOpts(func(s *charts.SingleSeries) {
		s.MarkLines = &opts.MarkLines{}
		s.MarkLines.Data = append(s.MarkLines.Data, &MyItem{
			Name:  "1111",
			YAxia: 200,
			LineStyle: opts.LineStyle{
				Color: "red",
			},
		})

	}))
	return bar
}