Xamarin.Forms How to put text/label over a BoxView element? - xaml

Question

I am trying to achieve the result such as in the attached design sample below, I want to add the label SIGN UP and LOGIN over the blue and dark color BoxViews that I successfully created to match the design.
It seems that I cannot add label into a BoxView in Xamarin.Forms so I would like to please know what is a good way to achieve this result.
Currently I am overlapping the BoxViews over the middle column.
<Grid
Margin="0"
ColumnSpacing="0"
RowSpacing="0"
VerticalOptions="FillAndExpand"
HorizontalOptions="FillAndExpand">
<Grid.RowDefinitions>
<!--0 blank -->
<RowDefinition Height="5*" />
<!--1 logo -->
<RowDefinition Height="15*" />
<!--2 blank -->
<RowDefinition Height="5*" />
<!--3 main title-->
<RowDefinition Height="5*" />
<!--4 main title -->
<RowDefinition Height="5*" />
<!--5 main title-->
<RowDefinition Height="5*" />
<!--7 blank-->
<RowDefinition Height="15*" />
<!--8 subtitle-->
<RowDefinition Height="5*" />
<!--9 subtitle-->
<RowDefinition Height="5*" />
<!--10 blank-->
<RowDefinition Height="0*" />
<!--11 signup login bar-->
<RowDefinition Height="7*" />
<!--12 signup login bar-->
<RowDefinition Height="7*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="65*" />
<ColumnDefinition Width="5*" />
<ColumnDefinition Width="30*" />
</Grid.ColumnDefinitions>
<Image Source="homePageLogo.png"
Grid.Row="1"
Grid.Column="0"
Grid.ColumnSpan="3"
HorizontalOptions="Center"
HeightRequest="120"
Aspect="AspectFit">
</Image>
<Label
Text="{Binding MainTitle}"
Grid.Row="3"
Grid.RowSpan="4"
Grid.Column="0"
Grid.ColumnSpan="3"
FontFamily="Gibson"
FontAttributes="Bold"
TextColor="White"
FontSize="50"
LineBreakMode="WordWrap"
HorizontalOptions="CenterAndExpand"
HorizontalTextAlignment="Center">
</Label>
<Label
Text="{Binding SubTitle}"
Grid.Row="8"
Grid.RowSpan="2"
Grid.Column="0"
Grid.ColumnSpan="3"
FontFamily="Poppins"
FontAttributes="Bold"
TextColor="White"
FontSize="Large"
LineBreakMode="WordWrap"
HorizontalOptions="CenterAndExpand"
HorizontalTextAlignment="Center">
</Label>
<!-- This is the boxview that should contain the LOGIN label -->
<BoxView
Grid.Row="11"
Grid.Column="1"
Grid.ColumnSpan="2"
Grid.RowSpan="2"
BackgroundColor="#2F3237">
</BoxView>
<!-- This is the boxview that should contain the SIGNUP label -->
<BoxView
Grid.Row="11"
Grid.Column="0"
Grid.ColumnSpan="2"
Grid.RowSpan="2"
BackgroundColor="#337EF3"
CornerRadius="0,15,0,15">
</BoxView>
</Grid>