How to store category attributes?

Question

Database design

You need to add attributes to the categories: Color, Size.

table for attributes

Schema::create('advert_attributes', function (Blueprint $table) {
            $table->id();
            $table->string('name')->unique();
            $table->string('slug')->unique();
            $table->string('type');
            $table->string('required')->nullable();
            $table->string('variants')->json();
            $table->integer('sort')->default(1);
        });

table for categories

Schema::create('adverts_categories', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name')->index();
            $table->string('slug');
            $table->nestedSet();
        });

I will create an intermediate table for linking categories and attributes using the many_to_many link. Then I will create these connections in the models. And then on the page for creating categories I will get all the attributes, and I will link the necessary ones to this category.
And what to do with attribute options, because each category will have its own? Where to store them?