Include Hidden Fields in XML

Hello!

I want to include a xml into the email notification. Something like this:

<.!–<?xml version=“1.0” encoding=“utf-8”?.>
<.object.>
<.hidden_field1.>{{field_value1}}<./hidden_field1.>
<.hidden_field2.>{{field_value2}}<./hidden_field2.>
<./object.>

In short, I have to put them dinamically into the xml… It can be done?

TY!