How to perform django full text searchvector on one model object field

Question

I have the following model which has response_results json field which contains large dataset of json objects:

My model Response_Grab has only one object with id 8 , i'm strong all data in one object,

from django.contrib.postgres.fields import JSONField,ArrayField
from django.contrib.postgres.search import SearchVectorField

class Response_Grab(models.Model):
    response_domains = ArrayField(models.TextField(blank=True),blank=True,null=True,default=list)
    response_results = JSONField(blank=True,null=True,default=dict)
    response_grab_interval = models.IntegerField(default=48)
    search_vector = SearchVectorField(null=True)

• response_results jsonfield format example:

{
"http://google.com": {"Version": "1.0", "Server": "AkamaiGHost"},
"https://facebook.com":{"Version":"1.0","Server":"Apache"},
...
...
}

• Here's what I did so far:

>> from elasticapp.models import Response_Grab as rg

>> from django.db.models import TextField
>> from django.db.models.functions import Cast ### TO Convert JSON to Text 
>> rg.objects.annotate(search=SearchVector(Cast('response_results',TextField())),).filter(search='http://google.com')
<QuerySet [<Response_Grab: default>]>

• How do I query such that providing following KEY http://google.com should return all its values ie {"Version": "1.0", "Server": "AkamaiGHost"} ?