MainPage.xaml

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:channels="clr-namespace:Microsoft.Maui.PlatformChannels.Controls;assembly=Microsoft.Maui.PlatformChannels"
             x:Class="SamplePlatformChannels.MainPage"
             BackgroundColor="{DynamicResource Secondary}">

    <VerticalStackLayout Padding="20">
        <Entry
            x:Name="entryNumbers"
            PlaceholderColor="{DynamicResource Gray400}"
            Placeholder="Numbers to add..." />

        <Button
            Clicked="Button_Clicked"
            Text="Add" />

        <Label
            Text="Result"
            Style="{StaticResource Headline}" />

        <Label
            Text="0"
            x:Name="labelResult"
            Style="{StaticResource SubHeadline}" />

        <Label
            Text="Platform Views"
            Style="{StaticResource Headline}"
            Margin="0,20,0,0" />

        <channels:PlatformChannelView
            x:Name="labelViewChannel"
            ChannelTypeId="labelView"
            OnReceiveFromPlatform="PlatformChannelView_OnReceiveFromPlatform" />

        <channels:PlatformChannelView
            x:Name="labelViewChannel2"
            ChannelTypeId="labelView" />
    </VerticalStackLayout>

</ContentPage>