Python 字段值总和的最大值

我有一个模型发票。下面是一个缩小版

class Invoice(models.Model):
    appointment = models.JSONField(blank=False, null=True)
    doctor_amount = models.FloatField(null=True, blank=True, default=0.00)

“预约”字段包含医生和患者：

"appointment": {
            "id": 14,
            "doctor": {
                "id": 103,
                "name": "MATTHEW"},
             "patient": {
                "id": 10,
                "name": "JAMES"}
                }

医生金额属于医生。我希望使用SQL查询来获取属于每个医生的医生金额的总和，然后从所有发票中获取具有最大医生金额总和的医生。我已经尝试了很多解决方案，但我认为两者都不太接近。所以我会留下来，希望能有新的想法

Views.py

class TopProvider(APIView):

def get(self, request, format=None):
    all_invoices = Invoice.objects.all()        
    invoices_serializer = InvoiceSerializer(all_invoices, many=True)
    invoices = invoices_serializer.data
    try:
        result = {}
        
        return Response(top_doc, status=status.HTTP_200_OK)

    except Exception as e:
        error = getattr(e, "message", repr(e))
        result["errors"] = error
        result["status"] = "error"

    return Response(result, status=status.HTTP_400_BAD_REQUEST) 
             

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为什么不使用聚合函数呢？