Xamarin Forms. Button image size

There is a button. It has a picture on it. The picture is obviously larger than it should be. How do I make the image shrink or grow to the size of the button?

There is a code like this.

        <Button Text="Протокол агронома" ImageSource ="ProtocolImage.png"  Style="{StaticResource buttonStyle}"
                RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToParent, Property=Height, Factor = .1}"
                RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent, Property=Width, Factor = .9}"
                RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToParent, Property=Width, Factor = .05}"
                RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent, Property=Height, Factor = .3}"
            ContentLayout="Left, -300"
/>
    </RelativeLayout>```