How can I access the dictionary model?

Question

So I basically have this model;

// MARK: - Welcome
struct Welcome: Codable {
    let league: League
    }
}

// MARK: - League
struct League: Codable {
    let standard: [Sacramento]
}

// MARK: - Sacramento
struct Sacramento: Codable {
    let firstName, lastName: String
    }
}

But when I try to access the firstName or lastName, I can't and can't find it.

 var result: Welcome?
  
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let text = result?.league.standard. // this is where I can't access...