How to pass url variable in django admin inline form?

I want to pre-populate the values ​​in the admin form from the URL parameters. For normal fields, this works by simply adding /? Field_name = parameter values ​​in the URL. However, my field is located in the built-in admin form on the form. Is there a way to pass URL parameters through an inline form? For instance:

models.py:

class Parent(Model):
    ...

class Child(Model):
    name = CharField(max_length=20)
    provenance = ManyToManyField('Provenance')

class Provenance(Model):
    child = ForeignKey(Child)
    parent = ForeignKey(Parent)

admin.py:

class ProvenanceInline(admin.StackedInline):
    model = Provenance
    form = myforms.ProvenanceForm
    ...

class ChildAdmin(admin.ModelAdmin):
   form = myforms.ChildForm
   [inlines] = ProvenanceInline
   ...

Now I have a custom view for showing the Parent object, and in this view, I would like to have a link to create this Parent's Child. Theoretically this will work:

<a href="{%url 'admin:myapp_child_add'%}?parent={{origin.pk}}">Add Child</a>

The problem is that the “parent” field is hidden inside Formline InlineAdmin. How to make ProvenanceForm see a URL variable passed to ChildForm?

get_formset ProvenanceInline get_inline_instances ChildAdmin, . (BTW, ChildForm , request, . , self.request). !