i used pie chart in my app, with swift5. i want to add gradiun color in it

language #swift5 xcode 13.4.1 use pod 'Charts' implement only 2 fields with different colour i wanted to add gradian colour in chart field

code i wrote:-

viewChartMain.layer.cornerRadius = 1 viewChartMain.layer.borderWidth = 0.3

    chart.frame = CGRect(x: 0, y: 0, width: viewChart.frame.size.width, height: viewChart.frame.size.height)
    chart.holeRadiusPercent = 0.7
    viewChart.addSubview(chart)
    chart.isUserInteractionEnabled = false

// chart.legend.enabled = false chart.usePercentValuesEnabled = false

    chart.transparentCircleColor = .clear
    
    var entries = [ChartDataEntry]()
    entries = [
        ChartDataEntry(x: 1, y: 1),
        ChartDataEntry(x: 3, y: 1)
    ]
    let set = PieChartDataSet(entries: entries)
    set.colors = [#colorLiteral(red: 0.3775092733, green: 0.5969132757, blue: 0.7176084175, alpha: 1), #colorLiteral(red: 0.2037627516, green: 0.2271897514, blue: 0.8380138849, alpha: 1)]
    let data = PieChartData(dataSet: set)
    chart.data = data