How to use map function to display number of items associated with each city in laravel

 $all_cities = Item::leftJoin('states', 'items.state_id', '=', 'states.id')->leftJoin('cities', 'items.city_id', '=', 'cities.id')->orderBy('cities.city_name', 'ASC')
          ->select(
              'items.city_id',
              'states.state_slug',
              'states.state_abbr',              
              'cities.city_name',
              'cities.city_slug',
              'cities.city_state'
          )->groupby('items.city_id')->take(45)->get();

 $citiesWithExtraValue = $all_cities->map(function ($city) {
                $count = DB::table('items')
                ->where('city_id', '=', $city->city_id)
                ->count();
            $city->count = $count;
            return $city;
               });

[
    {
        "city_id": 1,
        "state_slug": "ny",
        "state_abbr": "NY",
        "city_name": "New York",
        "city_slug": "new-york",
        "city_state": "NY",
        "count": 10  // The count of items associated with New York
    },
    {
        "city_id": 2,
        "state_slug": "ca",
        "state_abbr": "CA",
        "city_name": "Los Angeles",
        "city_slug": "los-angeles",
        "city_state": "CA",
        "count": 5   // The count of items associated with Los Angeles
    },
    // ... and so on for other cities
] 

<section class="states bg-warning bg-opacity-10 py-5" style="background-color:#fff9eb !important;">
  <div class="container py-sm-5">
  <div class="top_title mb-5 pb-5">
      <h2 class="main_title text-center text-warning position-relative"> Business for sale by <span class="text-dark">Top Cities</span> </h2>
    </div>
    @if($all_cities->count() > 0)
            <div class="row row-cols-md-5 row-cols-sm-2 row-cols-1">
            @php           
            foreach($all_cities as $all_city_key => $city)
            {               
                     @endphp
                        <div class="col-sm-12 col-md-6 col-lg-4 mb-3">
                        @if ($city->city_state)
                            <a href="{{ route('page.city', ['state_slug'=>$city->city_state, 'city_slug'=>$city->city_slug]) }}">
                                {{ $city->city_name.", ".$city->state_abbr }} ({{ $city->count }})</a>
                            @endif
                        </div>
                     @php                        
                }
                 @endphp
            </div>
    @endif
  </div>
</section>