Take an element of the json by key/value and in any position it is

String-Extensions.swift

public extension String {
    /// Search a json key/value and return the relative full json object
    func searchAndDecode<T: Codable>(key: String?, value: String?) -> [T]? {
        guard let key, let value else { return nil }
        let pattern = "\\{[^}]*?\"\(key)\".*\"\(value)\"[^}]*\\}"
        guard let list = self.replacingOccurrences(of: "{", with: "{\n").capture(pattern: pattern),
              let data = "[\(list.joined(separator: ","))]".data(using: .utf8),
              let items = try? JSONDecoder().decode([T].self, from: data)
        else { return nil }
        return items
    }

    /// Capture multiple values using regular expressions
    func capture(pattern: String) -> [String]? {
        guard let regex = try? NSRegularExpression(pattern: pattern, options: .caseInsensitive) else { return nil }
        let matchs = regex.matches(in: self, options: [], range: NSRange(location:0, length: self.count))
        return matchs.map({
            match in (0..<match.numberOfRanges).map({
                return (self as NSString).substring(with: match.range(at: $0))
            })
        }).reduce([], +)
    }
}