How to handle data and data models in SwiftUI

I am having trouble with the structure of my data for creating a List in SwiftUI. Before SwiftUI I created my data models and held this data in separated files. For example,

In my UserModel.swift :

import SwiftUI

struct UserModel: Equateable {

    var name: String
    var items = [ItemModel]()

    init(name: String, items: [ItemModel]? = nil) {
        self.name = name
        if let items = items {
            self.items = items
        }
    }
}

In my ItemModel.swift :

import SwiftUI

struct ItemModel: Equatable {
    var itemName: String
    var price: Double

    init(itemName: String, price: Double) {
        self.itemName = itemName
        self.price = price
    }
}

Then I had a separate class called Data that held this data.

In my Data.swift :

 import Foundation

class Data {
    static var userModels = [UserModel]()
    static var itemModels = [ItemModel]()
}

I would update the data by doing something like this in my views:

let user = UserModel(name: "Bob")
Data.userModels.append(user)

I'm having trouble populating a List from this framework in SwiftUI. I tried to make both of my model classes conform to Identifiable but that doesn't seem to help in updating the list. This is what I'm doing so far:

Updated UserModel :

struct UserModel: Identifiable {
    var id = UUID()

    var name: String
    var items = [ItemModel]()

    init(id: UUID, name: String, items: [ItemModel]? = nil) {
        self.id = id
        self.name = name
        if let items = items {
            self.items = items
        }
    }
}

Updated ItemModel:

struct ItemModel: Identifiable {
    var id = UUID()

    var itemName: String
    var price: Double

    init(id: UUID, itemName: String, price: Double) {
        self.id = id
        self.itemName = itemName
        self.price = price
    }
}

And in my ContentView.swift

List (Data.userModels) { user in
    Text("\(user.name)")

}

But this does not update the List when I am running the app. (Btw I take input from TextField, append it to Data.userModels, and try to populate it in the List with no luck.)

Is there a different way I should be structuring my data and data models? Or am I just not using the proper syntax when creating the list? Sorry for the long question. Thanks for the help!