Hello Xamarin Profs

I'm new to MVVM and I'm trying to bind a label together with my picker, but I want another value from the selected picker items.

I'm calling a list/Observable Collection from another page as my pickers items source, and then use ItemDisplayBinding to choose the value of the items I want to display like below XAML:

        <Picker x:Name="picker1"
                        Title="Vælg bygningsdel"
                        HorizontalOptions="FillAndExpand"
                        ItemsSource="{Binding Items}"
                        ItemDisplayBinding="{Binding NameAndValue}"
                        IsVisible="true"/>

                    <!--//BINDING//    StringFormat='λ = {0}'}-->
                    <Label Text="This is a value" VerticalOptions="CenterAndExpand" HorizontalOptions="End" />

I then want the selected items "UValue" property to be displayed in the label at the bottom of the XAML - using MVVM and bindings.

My ViewModel for the view looks like:

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using LommeKonstruktoren.Models;
using Xamarin.Forms;
using LommeKonstruktoren.Services;
using System.Diagnostics;
using System.Threading.Tasks;
using System.ComponentModel;
using LommeKonstruktoren.Views;

namespace LommeKonstruktoren.ViewModels
{

    public class UValueViewModel : BaseViewModel
    {
        private Item _selectedItem;

        public double KorrektionForSpalterValue { get; }
        public ObservableCollection<Item> Items { get; }
        public Command LoadItemsCommand { get; }
        public Command AddItemCommand { get; }
        public Command SelectCorrection { get; }
        public Command<Item> ItemTapped { get; }
        public double Picker1Value { get; }

        public UValueViewModel()
        {
            Title = "U-værdiberegning";
            Items = new ObservableCollection<Item>();
            LoadItemsCommand = new Command(async () => await ExecuteLoadItemsCommand());
            SelectCorrection = new Command(SelectCorrectionButton);
        }


        private async void SelectCorrectionButton(object obj)
        {
            await Shell.Current.GoToAsync(nameof(BindersCorrectionPage));
        }

        // code for loading the items from materials list to the view // used for pickers

        async Task ExecuteLoadItemsCommand()
        {
            try
            {
                Items.Clear();
                var items = await DataStore.GetItemsAsync(true);

                foreach (var item in items)
                {
                    Items.Add(item);
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex);
            }
            finally
            {
                IsBusy = false;
            }
        }

        // Code for when view appears
        public void OnAppearing()
        {
            IsBusy = true;
        }
    }
    }

And the view it self looks like this:

How would I approach this? I need to use the values coming from the list, as the list is changed by the user (including the values).

Without MVVM and the list I would be able to solve this with the SelectedIndexChange event, but I'm not sure how it should be done in MVVM.

Hope someone can help.

****The app is in Danish, so ask if anything needs to be translated for the sake of helping and I'd gladly do it******