use annotation in chart

[ManikandanRajamanickam12]

pw.SquareAnnotation( child: chart, color: PdfColors.blue, author: "user", subject: "datetime", content: "display time"),

I want to annotate all points showing in graph.I use like this.But it is not working. help me to solve this

[ManikandanRajamanickam12]

pw.Annotation( child: chart1, builder: pw.AnnotationSquare( author: "user", subject: "datetime", content: "display time"))

i tried this also

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