How to add XML prolog with rust serde_xml

can I add the XML prolog when serializing with serde_xml?

struct User {
  name:String,
  last_name:String
}

becomes

<User>
  <name>Jimmy</name>
  <last_name>Foobar</last_name>
</User>

but I would like to have it with prolog:

<?xml version="1.0" encoding="UTF-8"?>
<User>
  <name>Jimmy</name>
  <last_name>Foobar</last_name>
</User>