Return DynamicResource in IValueConverter

I'm using my custom converter in my control's background.

<Border Background="{Binding IsSelected, Converter={StaticResource SelectedToProfileBorderBackgroundConverter}}" CornerRadius="8" Width="214" Height="112">

My converter will return a brush from the resourcedictionary that I declared.

public class SelectedToProfileBorderBackgroundConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            bool status = (bool)value;
            if (status)
            {
                return Application.Current.Resources["ProfileBorderSelectedBackground"];
            }
            else
            {
                return Application.Current.Resources["ProfileBorderBackground"];
            }
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

<SolidColorBrush x:Key="ProfileBorderBackground" Color="#EEEEEF"/>
<SolidColorBrush x:Key="ProfileBorderSelectedBackground" Color="#EEEEEF"/>

The problem is Application.Current.Resources["ProfileBorderSelectedBackground"] return a staticResource instead of DynamicResource.
So if I change the value of ProfileBorderSelectedBackground through a change in theme that user selected, the border background is not changed.
Is there a way to let Application.Current.Resources["ProfileBorderSelectedBackground"] return a DynamicResource instead of StaticResource?

Read more here: https://stackoverflow.com/questions/66997224/return-dynamicresource-in-ivalueconverter