Python Django, why not serialize python dictionary to object JSON?

Question

Django

There is such a view:

def lazy_ajax(request):
        if request.is_ajax():
           news = {}
           query = request.GET.get('value', 14)
           news['news'] = News.objects.all()[query:]
           return JsonResponse(json.dumps(news, ensure_ascii=False), content_type='application/json', safe=False)

I am getting this error:

TypeError: <QuerySet [<News: В Челябинске эксперты обсудят  и т.д.

How can I do the conversion of a dictionary?