Need addElement and addElements to allow single insertion instead of to all elements with matching tag

if (Target.Platform == UnrealTargetPlatform.IOS)
{
                string PluginPath = Utils.MakePathRelativeTo(ModuleDirectory, BuildConfiguration.RelativeEnginePath);
                AdditionalPropertiesForReceipt.Add(new ReceiptProperty("IOSPlugin", Path.Combine(PluginPath, "Test_UPL.xml")));
}

<?xml version="1.0" encoding="utf-8"?>
<root>
	<!-- init section is always evaluated once per architecture -->
	<init>
		<log text="Test UPL init"/>
		<setString name="APIKey" value="testkey"/>
	</init>
	
	<iosPListUpdates>
		<!-- Add Fabric.io ApiKey -->
		<addElements tag="dict" once="true">
			<key>Fabric</key>
		</addElements>
		<setElement result="FabricKey" xml="&lt;dict&gt;&lt;key&gt;APIKey&lt;/key&gt;&lt;string&gt;$S(APIKey)&lt;/string&gt;&lt;key&gt;Kits&lt;/key&gt;&lt;array&gt;&lt;dict&gt;&lt;key&gt;KitInfo&lt;/key&gt;&lt;dict/&gt;&lt;key&gt;KitName&lt;/key&gt;&lt;string&gt;Crashlytics&lt;/string&gt;&lt;/dict&gt;&lt;/array&gt;&lt;/dict&gt;"/>
		<addElement tag="dict" name="FabricKey" once="true"/>
	</iosPListUpdates>
</root>