How to convert an object serialized from a model to another object serialized to another model? - django-rest-framework

Question

I am new to Django rest framework and vuejs and I am training by doing a CRM.
I have a model lead with leadnote and serializer and another model client with note and serializer. To convert a lead to a client, I made it with #api view in client views :
#api_view(['POST'])
def convert_lead_to_client(request):
company = Company.objects.filter(members__in=[request.user]).first()
lead_id = request.data['lead_id']
try:
lead = Lead.objects.filter(company=company).get(pk=lead_id)
except Lead.DoesNotExist:
raise Http404
client = Client.objects.create(company=company, name=lead.lead_company, contact_person=lead.contact_person, email=lead.email, phone=lead.phone, website=lead.website, created_by=request.user)
return Response()
It allow to convert the lead into client but I would like also to create note for the client that are the lead notes. Do you have any idea how I could implement that ?
Thanks
**For info : **
**Model Lead and LeadNote:**
class Lead(models.Model):
NEW = 'new'
CONTACTED = 'contacted'
INPROGRESS = 'inprogress'
LOST = 'lost'
WON = 'won'
CHOICES_STATUS = (
(NEW, 'New'),
(CONTACTED, 'Contacted'),
(INPROGRESS, 'In progress'),
(LOST, 'Lost'),
(WON, 'Won'),
)
LOW = 'low'
MEDIUM = 'medium'
HIGH = 'high'
CHOICES_PRIORITY = (
(LOW, 'Low'),
(MEDIUM, 'Medium'),
(HIGH, 'High'),
)
company = models.ForeignKey(Company, related_name='leads', on_delete=models.CASCADE)
lead_company = models.CharField(max_length=255)
contact_person = models.CharField(max_length=255)
email = models.EmailField()
phone = models.CharField(max_length=255)
website = models.CharField(max_length=255, blank=True, null=True)
confidence = models.IntegerField(blank=True, null=True)
estimated_value = models.IntegerField(blank=True, null=True)
status = models.CharField(max_length=25, choices=CHOICES_STATUS, default=NEW)
priority = models.CharField(max_length=25, choices=CHOICES_PRIORITY, default=MEDIUM)
assigned_to = models.ForeignKey(User, related_name='assignedleads', blank=True, null=True, on_delete=models.SET_NULL)
created_by = models.ForeignKey(User, related_name='leads', on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now_add=True)
modified_at = models.DateTimeField(auto_now=True)
class LeadNote(models.Model):
company = models.ForeignKey(Company, related_name='lead_notes', on_delete=models.CASCADE)
lead = models.ForeignKey(Lead, related_name='lead_notes', on_delete=models.CASCADE)
name = models.CharField(max_length=255)
body = models.TextField(blank=True, null=True)
created_by = models.ForeignKey(User, related_name='lead_notes', on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now_add=True)
modified_at = models.DateTimeField(auto_now=True)
**Model Client and Note** :
class Client(models.Model):
company = models.ForeignKey(Company, related_name='clients', on_delete=models.CASCADE)
name = models.CharField(max_length=255)
contact_person = models.CharField(max_length=255)
email = models.EmailField()
phone = models.CharField(max_length=255)
website = models.CharField(max_length=255, blank=True, null=True)
created_by = models.ForeignKey(User, related_name='clients', on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now_add=True)
modified_at = models.DateTimeField(auto_now=True)
class Note(models.Model):
company = models.ForeignKey(Company, related_name='notes', on_delete=models.CASCADE)
client = models.ForeignKey(Client, related_name='notes', on_delete=models.CASCADE)
name = models.CharField(max_length=255)
body = models.TextField(blank=True, null=True)
created_by = models.ForeignKey(User, related_name='notes', on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now_add=True)
modified_at = models.DateTimeField(auto_now=True)