Code from the Model class to generate the html/css and svg below

        
        public string Html { get; private set; }
        public string Css { get; private set; }
        public string SvgChart { get; private set; }

        public async Task LoadHtmlAndChartExport()
        {
            var package = CreateWorkbook(ChartType, ChartStyle, TableStyle);
            var sheet = package.Workbook.Worksheets[0];
            var exporter = sheet.Cells.CreateHtmlExporter();
            var settings = exporter.Settings;
            settings.Drawings.Include = eDrawingInclude.IncludeInCssOnly; // Exclude the chart from the HTML export, we will export it as a separate SVG. Optionally you could use the eDrawingInclude.IncludeAsClass option to include the chart in the HTML export as a class.
            settings.Culture = CultureInfo.InvariantCulture;

            settings.TableId = "currency-table";
            settings.AdditionalTableClassNames.Add("table");
            settings.AdditionalTableClassNames.Add("table-sm");
            settings.AdditionalTableClassNames.Add("table-borderless");
            
            Html = await exporter.GetHtmlStringAsync(); // Get the HTML string for the worksheet without the chart as a table.
            Css = await exporter.GetCssStringAsync();   //Get the CSS string for the worksheet without the chart as a table. You could include the drawing in the css as a class, but in this case we want to export the chart as a separate SVG.
            SvgChart = sheet.Drawings[0].ToSvg(x => { x.SvgSize.Width.SetPercent(100); x.SvgSize.Height.Remove(); });       //Get the chart as a separate SVG string.
        }
        
        public static ExcelPackage CreateWorkbook(SelectedChartType chartType, ePresetChartStyleMultiSeries chartStyle, TableStyles tableStyle)
        {
            var package = new ExcelPackage();
            var sheet = package.Workbook.Worksheets.Add("Html export with svg chart");

            var range = sheet.Cells["A1"].LoadFromCollection(_salesData, true, tableStyle);
            sheet.Cells["B2:C7"].Style.Numberformat.Format = "#,##0";
            sheet.Cells["D2:D7"].Style.Numberformat.Format = "#,##0.00%";
            ExcelChart chart;
            switch (chartType)
            {
                case SelectedChartType.ComboChart:
                    chart = sheet.Drawings.AddChart("RegionalSalesChart", eChartType.ColumnClustered);
                    var s1 = chart.Series.Add(sheet.Cells["B2:B7"], sheet.Cells["A2:A7"]);
                    s1.HeaderAddress = sheet.Cells["B1"];
                    var s2 = chart.Series.Add(sheet.Cells["C2:C7"], sheet.Cells["A2:A7"]);
                    s2.HeaderAddress = sheet.Cells["C1"];
                    var lineChartType = chart.PlotArea.ChartTypes.Add(eChartType.Line);

                    lineChartType.UseSecondaryAxis = true;
                    var s3 = lineChartType.Series.Add(sheet.Cells["D2:D7"], sheet.Cells["A2:A7"]);
                    s3.HeaderAddress = sheet.Cells["D1"];
                    break;
                case SelectedChartType.LineChart:
                    chart = sheet.Drawings.AddChart("RegionalSalesChart", eChartType.LineMarkers);
                    var s=chart.Series.Add(sheet.Cells["D2:D7"], sheet.Cells["A2:A7"]);
                    s.HeaderAddress = sheet.Cells["D1"];
                    break;
                case SelectedChartType.ColumnChart:
                    chart = sheet.Drawings.AddChart("RegionalSalesChart", eChartType.ColumnClustered);
                    s1 = chart.Series.Add(sheet.Cells["B2:B7"], sheet.Cells["A2:A7"]);
                    s1.HeaderAddress = sheet.Cells["B1"];
                    s2 = chart.Series.Add(sheet.Cells["C2:C7"], sheet.Cells["A2:A7"]);
                    s2.HeaderAddress = sheet.Cells["C1"];
                    var barChart = chart as ExcelBarChart;
                    barChart.Overlap = -5;

                    break;
                case SelectedChartType.BarChart:
                    chart = sheet.Drawings.AddChart("RegionalSalesChart", eChartType.BarClustered);
                    s1 = chart.Series.Add(sheet.Cells["B2:B7"], sheet.Cells["A2:A7"]);
                    s1.HeaderAddress = sheet.Cells["B1"];
                    s2 = chart.Series.Add(sheet.Cells["C2:C7"], sheet.Cells["A2:A7"]);
                    s2.HeaderAddress = sheet.Cells["C1"];
                    barChart = chart as ExcelBarChart;
                    barChart.Overlap = -10;
                    break;
                case SelectedChartType.PieChart:
                default:
                    chart = sheet.Drawings.AddChart("RegionalSalesChart", eChartType.PieExploded);
                    chart.Series.Add(sheet.Cells["D2:D7"], sheet.Cells["A2:A7"]);
                    var pieChart = chart as ExcelPieChart;
                    chart.StyleManager.SetChartStyle(chartStyle);
                    pieChart.DataLabel.ShowPercent = true;
                    pieChart.DataLabel.Border.Fill.Style=eFillStyle.SolidFill;
                    pieChart.DataLabel.Border.Fill.Color = Color.Black;
                    pieChart.DataLabel.Fill.Style = eFillStyle.SolidFill;
                    pieChart.DataLabel.Fill.Color = Color.LightCoral;
                    chart.SetPosition(2, 0, 5, 0);
                    chart.SetSize(1100, 300);
                    return package;
            }

            chart.StyleManager.SetChartStyle(chartStyle);
            chart.SetPosition(2,0,5, 0);
            chart.SetSize(1100,400);

            return package;
        }