Django custom SQL to return QuerySet where each object has additional properties

squirrel_table
  - name
  - country_of_origin
  - id

nut_table
  - id
  - squirrel_who_owns_me[fk to squirrel]

select sq.*,
       nut_counts.nut_count
  from squirrel_table sq,
      (select sq2.id as squirrel_id,
              count(nuts) as nut_count
         from squirrel_table sq2,
              nut_table nuts
        where nuts.squirrel_who_owns_me = sq2.id
          and sq.country_of_origin = 'USA'
        group by sq2.id) as nut_counts
 where sq.id = nut_counts.squirrel_id

sql = 'select sq.id as pk, sq.* ... %s'
squirreled = squirrel_table.objects.raw(sql, ["arg1"])