In DeviceActivityReportScene count numberOfPickups for given Application

How can I count the number of pickups for a certain application?

The docs say that there is a struct ApplicationActivity within the DeviceActivityData: https://developer.apple.com/documentation/deviceactivity/deviceactivitydata

Using this code I receive a warning in XCode: Value of type 'DeviceActivityData' has no member 'applicationActivity'

struct ApplicationPickupCountReport: DeviceActivityReportScene {
    // Define which context your scene will represent.
    let context: DeviceActivityReport.Context = .applicationPickupCount
    
    // Define the custom configuration and the resulting view for this report.
    let content: (String) -> ApplicationPickupCountView
    
    func makeConfiguration(representing data: 
DeviceActivityResults<DeviceActivityData>) async -> String { 
        var totalPickups = 0
        let totalPickups = await data.flatMap { $0.applicationActivity }.reduce(0, {
            $0 + $1.numberOfPickups
        })
        return "\(totalPickups)"
    }

}