Calling Squarespace API in code block?

So I have a question. Would I be able to call the Squaresapce API through javascript thats in a code block?

As of now I have a code block which contains quite a large script and it basically involves the user adding products to an order list, but in a certain way (without going too much into the details).  The problem is that this order list is not in any way associated with products I have in my store. What I want is that when a user adds one of theese products in the code that runs in the code block, the shopping cart should be updated. Like is it possible to add a line of code in the code block that does something like the following:

When a user adds a component :

javascript pseudo code:

squarespaceAPI.call.addProduct(product).toCart(User)

Thanks!

I am not sure that I fully understand your question (a link to the site may help) but to add products to the Squarespace cart, they must have been created as products on a Squarespace store page.

Hi!

Yes I do understand that I need to add the products to my site, but the way I want to add them / remove them to/from the customers cart is where I am thinking of the possibility of using the Squarespace API to accomplish this. 

A link to the site is here:
https://www.smarti.dev/smarti-configuration-tool

When entering the site, select a couple of floors, and select how many rooms there are for each floor and press the generate button. 

What I am trying to accomplish is that when a user clicks on the "Add Component" button in a room and selects one, that item should be added to the cart. This should also work for removing the item and updating the amount. 

Thanks!