django query column

# Import necessary modules
from django.db.models import F, ExpressionWrapper, fields

# Define the queryset with annotation for the calculated column
queryset = YourModel.objects.annotate(
    calculated_column=ExpressionWrapper(
        F('existing_column') + F('another_column'),
        output_field=fields.FloatField()
    )
)

# Access the result using the annotated column
result = queryset.values('existing_column', 'another_column', 'calculated_column')