'How to format decoded JSON string into usable pieces in Swift?

I have the components I want to see in my print screen, but now I'm trying to format the results of a decoded JSON into something more usable. Here's my current code:

do {
         let macros = try JSONDecoder().decode(Instruction.self, from: data)
                    
         print(macros)
}

and the result prints:

Instruction(foods: [Multiple_Views.Food(nfCalories: 105.02, nfTotalFat: 0.39, nfTotalCarbohydrate: 26.95, nfDietaryFiber: 3.07, nfProtein: 1.29)])

How do I separate each component (Calories, Fat, Carbs, Fiber, Protein) so I can display them to the user individually? I'm having trouble using regex on 'macros' because Swift says

Cannot convert value of type 'Instruction' to expected argument type 'String'

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'How to format decoded JSON string into usable pieces in Swift?

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