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You can get your exact output by filtering the values you want to count, getting the list of values, and counting them, all in one set of database calls:

from django.db.models import Count
MyModel.objects.filter(myfield__in=('abc', 'xyz')).\
        values('myfield').annotate(Count('myfield'))

django most efficient way to count same field values in a query - Stac...

django django-models django-queryset