ContentView with Own and Given Content - xaml

Question

In an app I have two ContentView controls I am trying to compose within a top-level ContentPage. The first, ScaffoldView, contains some layout elements I want to have throughout the app:
<?xml version="1.0" encoding="UTF-8"?>
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
x:Class="App.ScaffoldView">
<ContentView.Content>
<Grid
Margin="10,35,10,10"
VerticalOptions="FillAndExpand">
<Grid.RowDefinitions>...</Grid.RowDefinitions>
<!-- Awesome header stuff -->
<!-- I'd like the below to take given content -->
<ContentView
Grid.Row="..."
Content="{Binding Content}" />
<!-- Even more awesome footer stuff -->
</Grid>
</ContentView.Content>
</ContentView>
The second, InputsView, just has a few pairs of Label/Entry elements:
<?xml version="1.0" encoding="UTF-8"?>
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
x:Class="App.InputsView">
<ContentView.Content>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Label Text="Label1"
FontSize="Medium"
VerticalTextAlignment="Center"
HorizontalTextAlignment="End" />
<Entry Grid.Column="1"
Text="Input1"
VerticalOptions="Center" />
<Label Grid.Row="1"
Text="Label2"
FontSize="Medium"
VerticalTextAlignment="Center"
HorizontalTextAlignment="End" />
<Entry Grid.Row="1"
Grid.Column="1"
Text="Input2"
VerticalOptions="Center" />
<Label Grid.Row="2"
Text="Label3"
FontSize="Medium"
VerticalTextAlignment="Center"
HorizontalTextAlignment="End" />
<Entry Grid.Row="2"
Grid.Column="1"
Text="Input3"
VerticalOptions="Center" />
</Grid>
</ContentView.Content>
</ContentView>
Finally, the top-level ContentPage:
<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:controls="clr-namespace:App"
x:Class="App.MainPage">
<controls:ScaffoldView>
<controls:InputsView />
</controls:ScaffoldView>
</ContentPage>
Currently, all that shows is the InputsView. I suppose this is just because the entire Content of the MainPage is taken up with the ScaffoldView, and the entire Content of the ScaffoldView as defined in Scaffold.xaml is overridden by the <controls:InputsView /> tag.
Ideally, I'd like there to be some way of including <controls:InputsView /> inside the opening and closing <controls:ScaffoldView> tags as above, and it show this given content within the ScaffoldView's own content defined within Scaffold.xaml.
Is it possible to nest/mix Content this way, or will I need to define a custom property, e.g. ChildContent?