Django orm query_set
Solution 1:
If you are using Postgres, you can try this:
from django.contrib.postgres.aggregates import ArrayAgg
a = TestManager.objects.filter(company_code__in=sub_company).values(
'vehicle__name',
'vehicle__number'
).annotate(
vc=Count("vehicle__name"),
user_id_first_names=ArrayAgg('user_id_first_name', distinct=True)
).order_by('vehicle__name')