Katy here from Shopify! Pleasure to have you here. :D
There may be some apps which can help you out with this. Each allows you to add custom fields on your product pages within the admin.
There are also some paid options which may suit too:
Do have a look, and let me know what you think!
No problem at all.
Yes, you can do this by adding the data as a json array to the section file.
You could either add it as JS, or else add it as a data attribute tag to an element and then retrieve it with jQuery.
This would be quite advanced and beyond the scope of our own support at Shopify, though if you do need a hand with it, some of our community members may be able to chime in with their own experience. Or alternatively, you may like to reach out to work with a Shopify Expert directly.
I hope this helps you out!