JSON字符串中的变量

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我正在开发制作简历的应用，并且我有一个JSON文件，其中包含用户可以选择的职位描述。问题在于用户飞行的飞机可能很多，我想添加一个我可以在JSON字符串中更改的变量。像这样：

{
"data":[
  {
    "jobDescription": "Worldwide Passenger and freighter flights in all weather conditions, on the modern " + yourAirplane + ". I Have gained experience flying to destinations in all continents while working with different nationalities"
  }
 ]
}

我一直在搜寻，但找不到任何东西。我用以下代码解析字符串：

struct  JobDescriptionData : Decodable{
    var data:[JobDescritpion]?
}

class JobDescritpion:  NSObject, Decodable {

    static let shared = JobDescritpion()

    var jobDescription : String?

    func loadJobDescriptions(completion: ([JobDescritpion]) -> ()){
        let path = Bundle.main.path(forResource: "jobDescription", ofType: "json")!
                do {
                    let data = try Data(contentsOf: URL(fileURLWithPath: path), options: .mappedIfSafe)
                    data.printJSON()
                    let decoder = JSONDecoder()
                    guard let eventResult = try? decoder.decode(JobDescriptionData.self, from: data) else { return }

                    var array = [JobDescritpion]()
                    array = eventResult.data!
                    completion(array)

                    } catch {
                }
    }
}

printJSON() (which is my extension to Data to print the json array) works and it returns the array but of course, the guard let fails because jobDescription is not a string.

关于如何添加变量，然后稍后在应用程序中进行设置的任何建议？