'how to add value in exiting list in Update Query in Django

i have model which containing a list, i want to append value in all instances from this model

class model(models.Model):
    title = models.CharField(max_length=255)
    roles = ArrayField(base_field=models.TextField(choices=ModelRoles.choices()), default=list)

my update statement is

model.objects.all.update(roles=roles.append("new role"))

python django

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'how to add value in exiting list in Update Query in Django

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