Addition in a custom theme

You can see a example with https://github.com/Lacro59/playnite-defaultextend-theme.

Differents resources disponible with PluginSettings

The SourceName for the plugin is LibraryManagement

Plugin settings

CustomOption	Type	Default	Description
EnableIntegrationFeatures	bool	true	Parameters to display or not the plugin feature icons list.
EnableIntegrationAgeRatings	bool	true	Parameters to display or not the plugin age rating icons.

Plugin data for game selected

CustomOption	Type	Default	Description
HasData	bool	false	Indicates if the game has data.
DataCount	int	0	Count of feature icons
DataList	List	List empty	details

Integration of plugin elements with ContentControl

Visibility

Visibility according to the presence of the plugin

<StackPanel Visibility="{PluginStatus Plugin=<PluginId>, Status=Installed}">
</StackPanel>

Visibility depending the element visibility parameter in plugin settings

If the item is not enabled in the plugin settings, it is collapsed.

Visibility according to the visibility of the element

<StackPanel Visibility="{Binding ElementName=<SourceName>_<ElementName>, Path=Visibility}">
</StackPanel>

Plugin elements

Features icons list (supporting the different options in the plugin settings)

<ContentControl x:Name="LibraryManagement_PluginFeaturesIconList" Height="obligatory" />

Age icons (supporting the different options in the plugin settings)

<ContentControl x:Name="LibraryManagement_PluginAgeRating" Height="obligatory" />

Custom elements with plugin data

Custom list of supported features(example)

<ListBox ItemsSource="{PluginSettings Plugin=LibraryManagement, Path=DataList}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Grid Margin="0,2">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="auto" />
                </Grid.ColumnDefinitions>

                <Image Grid.Column="0" HorizontalAlignment="Center" Height="24" VerticalAlignment="Center" Width="24" 
				       Source="{Binding IconBitmapImage}" ToolTip={Binding NameAssociated } />
            </Grid>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>