Convert localizable.string file to JSON in iOS swift

I have 3 Localizable files in my project Localizable.string(English), Localizable.string(German) and Localizable.string(French) with several keys and values of form localizationKey1 = "Text1 in english"; . I want them to be converted in a single json file in format

{
    "localizationKey1": {
        "en": "Text1 in english",
        "de": "Text1 in german",
        "fr": "Text1 in french"
    },
    "localizationKey2": {
        "en": "Text2 in english",
        "de": "Text2 in german",
        "fr": "Text2 in french"
    } and so on depending on number of keys
}

How do I go about it?

EDIT: I was able to the required JSON format based on the answer by @Francis but the orders of the outer and inner keys are messed up. Is there any way to order them?

Try this

        let path1 = (Bundle.main.path(forResource: "Localizable", ofType: "strings", inDirectory: nil, forLocalization: "en"))
        let path2 = (Bundle.main.path(forResource: "Localizable", ofType: "strings", inDirectory: nil, forLocalization: "de"))
        let path3 = (Bundle.main.path(forResource: "Localizable", ofType: "strings", inDirectory: nil, forLocalization: "fr"))
        let dict1 = NSDictionary(contentsOfFile: path1!)
        let dict2 = NSDictionary(contentsOfFile: path2!)
        let dict3 = NSDictionary(contentsOfFile: path3!)
        var newDict = [String : Any]()
        for (key, value) in dict1! {
            var value2 = ""
            var value3 = ""
            if let keyVal = dict2?[key] as? String {
                value2 = keyVal
            }

            if let keyVal = dict3?[key] as? String {
                value3 = keyVal
            }
            let tempDict = ["en": value, "de": value2, "fr": value3]
            newDict["\(key)"] = tempDict
        }
        do {
          let data = try JSONSerialization.data(withJSONObject: newDict, options: .prettyPrinted)
          let dataString = String(data: data, encoding: .utf8)!
          print(dataString) //This will give you the required JSON format
        } catch {
          print("JSON serialization failed: ", error)
        }