Thank you for your view. I'm looking to add a quantity + free gift section to my product details page. See this page -
I made a quick loom video describing the page - https://www.loom.com/share/8739d751fe1041ea8e663145e02bc2ab
As a customer I should be able to select the product in various bundles and receive a free gift.
App Selly cannot display exactly like your example page. However it can display bundle and free gift:
You can use Bundle King, it's exactly what the app is doing.
You can create a bundle with different design for each product page.