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String<-toJson(myObj);
myObj<-fromJson(jsonString,Type);

#ifndef PEOPLE_H
#define PEOPLE_H

#include <QObject>
#include <QDataStream>
#include <QMetaProperty>

class People : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int id READ getId WRITE setId)
    Q_PROPERTY(QString Name READ getName WRITE setName)

public:
    explicit People(QObject *parent = 0);
    int getId() const { return id; }
    void setId(int newId) { id = newId; }
    QString getName() const { return Name; }
    void setName(const QString &newName) { Name = newName; }

private:
    int id;
    QString Name;

signals:

public slots:

};

QDataStream &operator<<(QDataStream &ds, const People &obj);
QDataStream &operator>>(QDataStream &ds, People &obj) ;
#endif // PEOPLE_H

#include "people.h"

People::People(QObject *parent) :
    QObject(parent)
{
}


QDataStream &operator<<(QDataStream &ds, const People &obj) {
    for(int i=0; i<obj.metaObject()->propertyCount(); ++i) {
        if(obj.metaObject()->property(i).isStored(&obj)) {
            ds << obj.metaObject()->property(i).read(&obj);

        }
    }
    return ds;
}
QDataStream &operator>>(QDataStream &ds, People &obj) {
    QVariant var;
    for(int i=0; i<obj.metaObject()->propertyCount(); ++i) {
        if(obj.metaObject()->property(i).isStored(&obj)) {
            ds >> var;
            obj.metaObject()->property(i).write(&obj, var);
        }
    }
    return ds;
}

QVariantMap MainWindow::toMap(QObject obj)
{ 
    QVariantMap map;
    
   for(int i=0; i<obj.metaObject()->propertyCount(); ++i) {
        if(obj.metaObject()->property(i).isStored(&obj)) {
          QVariant var = obj.metaObject()->property(i).read(&obj);---Тут QVariant
          map.insert(???,var);
        }
    }

    return map;
}

#ifndef GPPPACKET_H
#define GPPPACKET_H

#include <QObject>

class GPPPacket : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString head READ getHead WRITE setHead)

private:
    QString head;

public:
    explicit GPPPacket(QObject *parent = 0);
    void setHead(QString head){this->head=head;}
    QString getHead(){return head;}
signals:

public slots:

};

#endif // GPPPACKET_H

#ifndef SCREENPREVIEW_H
#define SCREENPREVIEW_H

#include<gpppacket.h>

class ScreenPreview: public GPPPacket
{
    Q_PROPERTY(QString data READ getData)
    Q_PROPERTY(int index READ getIndex)

private:
    QString data;
    int index=-1;
public:
    ScreenPreview(int index,QString data);
    QString getData(){return data;}
    int getIndex(){return index;}
};

#endif // SCREENPREVIEW_H

QVariantMap MainWindow::toMap(QObject &obj)
{
    QVariantMap map;

    for(int i=0; i<obj.metaObject()->propertyCount(); ++i) {
        if(obj.metaObject()->property(i).isStored(&obj)) {
          map.insert(obj.metaObject()->property(i).name(),obj.metaObject()->property(i).read(&obj));
        }
    }

    return map;
}

Q_PROPERTY(QString data READ getData STORED true)
Q_PROPERTY(int index READ getIndex STORED true)

#ifndef SCREENPREVIEW_H
#define SCREENPREVIEW_H

#include<gpppacket.h>

class ScreenPreview: public GPPPacket
{
    Q_PROPERTY(QString data READ getData)
    Q_PROPERTY(int index READ getIndex)

private:
    QString data;
    int index=0;
public:
    ScreenPreview();
    QString getData(){return data;}
    int getIndex(){return index;}
};

#endif // SCREENPREVIEW_H

QVariantMap MainWindow::toMap(QObject &obj)
{
    QVariantMap map;

    for(int i=0; i<obj.metaObject()->propertyCount(); ++i) {
        if(obj.metaObject()->property(i).isStored(&obj)) {
          map.insert(obj.metaObject()->property(i).name(),obj.metaObject()->property(i).read(&obj));
        }
    }

    return map;
}

ScreenPreview preview;
QMessageBox::information(this,"Информация",QJsonDocument::fromVariant(toMap(preview)).toJson());

{
   "head":"",
   "objectName":""
}