Сбой NextJS с реакции-svg-загрузчик

Вы можете использовать RelativeSource.

Например, это может быть ваш OptionTemplate:

<UserControl x:Class="OptionTemplate"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:OptionTemplate"
             xmlns:i="clr-namespace:System.Windows.Interactivity;ssembly=System.Windows.Interactivity"
             xmlns:prism1="http://prismlibrary.com/"
             mc:Ignorable="d" >

   <Grid>
       <TextBlock Text="{Binding DataContext.Description, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ItemsControl}}" />
       <!-- Your others controls -->
   </Grid>

</UserControl>