Eloquent: Recursive hasMany Relationship with Unlimited Subcategories

caregories.blade.php

<ul>
    @foreach ($categories as $category)
        <li>{{ $category->name }}</li>
        <ul>
        @foreach ($category->childrenCategories as $childCategory)
            @include('subcategories', ['child_category' => $childCategory])
        @endforeach
        </ul>
    @endforeach
</ul>

Category.php

<?php 
class Category extends Model
{

    public function categories()
    {
        return $this->hasMany(Category::class);
    }

    public function childrenCategories()
    {
        return $this->hasMany(Category::class)->with('categories');
    }

}

create_categories_table.php

Schema::create('categories', function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->string('name');
    $table->unsignedBigInteger('category_id')->nullable();
    $table->foreign('category_id')->references('id')->on('categories');
    $table->timestamps();
});

subcategories.blade.php

<li>{{ $child_category->name }}</li>
@if ($child_category->categories)
    <ul>
        @foreach ($child_category->categories as $childCategory)
            @include('child_category', ['child_category' => $childCategory])
        @endforeach
    </ul>
@endif

It was Soo good and helpful. I have a question. How do we get the sub-categories count?
Ex : parent_id = 1,
1->2,
1->3,
2->4,
2->5,
2->6,
5->7,
5->8 ,
6->9,
9->10
Now the parent_id = 2 have child and grand children to count of = 7. How do I get the count.