How can I avoid accessibility to set isHeader?

[conandi]

internal struct AccessibleHeader {
    static func create(usingChart chart: ChartViewBase,
                                andData data: ChartData,
                                withDefaultDescription defaultDescription: String = "Chart") -> NSUIAccessibilityElement
    {
        let chartDescriptionText = chart.chartDescription.text ?? defaultDescription
        let dataSetDescriptions = data.map { $0.label ?? "" }
        let dataSetDescriptionText = dataSetDescriptions.joined(separator: ", ")

        let element = NSUIAccessibilityElement(accessibilityContainer: chart)
        element.accessibilityLabel = chartDescriptionText + ". \(data.count) dataset\(data.count == 1 ? "" : "s"). \(dataSetDescriptionText)"
        element.accessibilityFrame = chart.bounds
        element.isHeader = true
        
        return element
    }
}

How can I avoid to set isHeader?