public function fetchDepartmentApplicants(array $applicants, string $locale): Collection 	{ 		return DB::table('applicants')->join('departments', 'departments.id', '=', 'applicants.department_id') 									->selectRaw('count(*) as applicants_count, json_extract(departments.title, ?) as department', ["$.$locale"]) 									->whereIn('applicants.id', $applicants) 									->groupByRaw('department WITH ROLLUP') 									->get(); 	}