Snakeberry | A lightweight webservice based media player fpr

First of all, excuse me for my (sometimes) bad English, I'm french. I'm actually working on a role game project. The goal is to create a little macOS software (a generator) using Swift and Xcode that can create a potion (an effect associated with a potency) (like : "Fortify Speed 7/10") from multiple parameters. The app allows the user to enter two parameters : ingredients (selected in pop-up menus) and a dice roll (put in a text field). If those two (or more) ingredients have an effect in common, the soft makes an addition of the value of both effects and return this : ""effect in common" + (value of the 1st ingredient effect + value of 2nd ingredient effect)". The result can change during the operation depending on the dice roll, but it doesn't matter here. Here is an exemple to understand what I'm saying :

1st ingredient : "Cat's Claw Bark" -> Resist Lightning (4/10); Resist Psychic (3/10); Acid Damage (3/10); Fear (3/10); Invisibility (1/10). || 2nd ingredient : "Grape Holly" -> Cure Disease (5/10); Resist Cold (4/10); Heighten Medicine (4/10; Resist Lightning (3/10); Force Damage (2/10.

Because both ingredients have an effect in common (Resist Lightning), the soft returns that effect with an addition of the potency of the two effects. So it returns : "Resist Lightning (7/10)"

Here is my first question : How can I convert this into Swift code ? I've tried many ways but nothing useful. I tried to use arrays, dictionaries, arrays into dictionaries, but I'm still facing the same problem : How can I attribute multiple parameters (effects in this case) and types (String for the name of the effect and Int for its potency) to an instance ? (If it's the right question). My second question is : How can I compare keys (not values) of a dictionary to match a result ?

Maybe like this, using a dictionary, but I'll need to display in the result not only the value of the key in the dictionary, but the key itself. Also, I'll need to compare the keys, not the values :