How to put a label into specific place on the image

See below image please

on the top/left there is a rounded retangle(black). I need to put a label inside it. i'm having difficult to exactly put there, to hit. This way i load image

<Image x:Name="imgFaturamento" Grid.Row="0" Grid.Column="0" Source="{local:ImageResource Operacional.Images.faturamento-03.png}" Aspect="AspectFill" >
                    <Image.GestureRecognizers>
                        <TapGestureRecognizer Tapped="OnTapGestureReconizerTapped" NumberOfTapsRequired="1"></TapGestureRecognizer>
                    </Image.GestureRecognizers>
                </Image>

in this post the image is large, but in the page is normal, small.