Create objects in multiple nested serializer in django - django

Question

I have 3 models which are related to each other via ManytoMany relation like this:
class DemandEvents(models.Model):
date = models.DateTimeField(blank=True, null=True)
quantity = models.IntegerField(default=0)
class DemandFlows(models.Model):
events = models.ManyToManyField(DemandEvents)
flow = models.ForeignKey(Flow, on_delete=models.CASCADE)
kit = models.ForeignKey(Kit, on_delete=models.CASCADE)
monthly_quantity = models.IntegerField(default=0)
class Demand(models.Model):
demand_flows = models.ManyToManyField(DemandFlows)
delivery_month = models.DateTimeField(blank=True, null=True)
owner = models.ForeignKey(User, on_delete=models.CASCADE)
I am trying to create the serializers for this but keep getting confused how to handle the multi-level nesting
Serializer.py
class DemandEventsSerializer(serializers.ModelSerializer):
class Meta:
model = DemandEvents
fields = "__all__"
class DemandFlowsSerializer(serializers.ModelSerializer):
class Meta:
model = DemandFlows
fields = "__all__"
class DemandSerializer(serializers.ModelSerializer):
demand_flows = DemandFlowsSerializer(many=True)
class Meta:
model = Demand
fields = "__all__"
def create(self, validated_data):
items_objects = validated_data.pop('form_list', None)
prdcts = []
for item in items_objects:
i = DemandFlows.objects.create(**item)
prdcts.append(i)
instance = Demand.objects.create(**validated_data)
instance.demand_flows.set(prdcts)
return instance
How do I add events data to this DemandFlows?