Cannot get data from third table using relation in Laravel

I have three tables, structure are as follows:

products:
id | name | slug | price

product_attributes:
id | attribute_id | value | qty | product_id

attributes :
id | code | name 

Now i'm getting the product and the attributes selected for this particular product using the following relationships but i also want the code and name of the attribute from the third table i.e. attributes:

ProductController.php:

public function show($slug)
{
    $product = $this->productRepository->findProductBySlug($slug);
    return view('site.pages.product', compact('product'));
}

ProductRepository.php

   public function findProductBySlug($slug)
    {
    $product = Product::with('attributes')->where('slug', $slug)->first();

    return $product;
    }

Model : Product.php

public function attributes()
{
    return $this->hasMany(ProductAttribute::class);
}

getting data on view with following code:

but i also want data from the third table i.e. attributes

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