buildProperties example

$product['prices'] = $this->faker->randomElement($prices);

            $product['visibilities'] = $visibilities;

            if ($mediaIds) {
                $product['cover'] = ['mediaId' => Random::getRandomArrayElement($mediaIds)];

                $product['media'] = array_map(fn (string $id): array => ['mediaId' => $id], $this->faker->randomElements($mediaIds, random_int(2, 5)));
            }

            $product['properties'] = $this->buildProperties($properties);

            if ($i % 40 === 0) {
                $combination = $this->faker->randomElement($combinations);
                $product = [...$product, ...$this->buildVariants($combination, $prices, $taxes)];
            } elseif ($i % 20 === 0) {
                $product = [...$product, ...$this->buildDownloads($downloadMediaIds, $instantDeliveryId)];
            }

            $payload[] = $product;

            if (\count($payload) >= 20) {