[Python] python django latitude longitude filter in queryset

I have a field like

class MyModel(models.Model):
latitude = models.CharField(max_length=100, db_index=True)
longitude = models.CharField(max_length=100, db_index=True)


Lets say I have lat long value like

myval = (27.66469717424158, 85.30983049711507)


Here I want to find all the objects in MyModel which are less than 10 KM in distance from myval

I looked into geopy library. I think it is useful after I get the data from queryset.

How to achieve this ?

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