Is it possible to set recommendations to suggest products based on certain combinations in the shopping cart?

Currently we do not support this in this way through a single API.
A solution that could be implemented is:

• For each product in your cart, make a recommendations request (or any product you want)
• Combine the results of those calls
• Determine how many products from each response you want to use
• Decide which product should be in which position, for example you could prioritize accessories

With this solution you have complete control over the outcome.