Is there a Select field for saving morphToMany relationship?

using this relationship: https://laravel.com/docs/10.x/eloquent-relationships#many-to-many-polymorphic-relations

schemas defined:
        Schema::create('ad_categories', function (Blueprint $table) {
            $table->id();
            $table->string('name');
        });

        Schema::create('ad_categorisables', function (Blueprint $table) {
            $table->foreignId('ad_category_id');
            $table->integer('ad_categorisable_id');
            $table->string('ad_categorisable_type');
        });

        Schema::create('magazine_ads', function (Blueprint $table) {
            $table->id();
            $table->string('name');
        });


models defined:
class AdCategory extends BaseModel
{
    public function magazineAds(): MorphToMany
    {
        return $this->morphedByMany(MagazineAd::class, 'ad_categorisable');
    }
}

class MagazineAd
{
    public function adCategories(): MorphToMany
    {
        return $this->morphToMany(AdCategory::class, 'ad_categorisable');
    }
}


On MagazineAdResource, I want to attach one AdCategory to MagazineAd without using Relation Manager:
    $magazineAd = MagazineAd::first(); // example
    $adCategory = AdCategory::first();; // example


    $magazineAd->adCategories()->attach($adCategory->id); // trying to achieve this part
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