How to import VSCode HL7 Custom Schema

How to import Custom Schemas from VSCode? They look like this:

<?xml version="1.0"?>
<Category name="ITK" description="xmlns:hl7='urn:hl7-org:v2xml' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'" std="1">
<MessageType name='ACK' structure='ACK' returntype='ACK' description='xsi:schemaLocation="urn:hl7-org:v2xml ACK.xsd"'/>
</Category>

Instead of wrapped XML export produced by $system.OBJ:

<?xml version="1.0" encoding="UTF-8"?>
<Export generator="IRIS" version="26" zv="IRIS for Windows (x86-64) 2022.1 (Build 209U)" ts="2023-06-15 20:19:56">
<Document name="ITK.HL7">
<Category name="ITK" description="xmlns:hl7='urn:hl7-org:v2xml' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'" std="1">
<MessageType name='ACK' structure='ACK' returntype='ACK' description='xsi:schemaLocation="urn:hl7-org:v2xml ACK.xsd"'/>
</Category>
</Document>
</Export>

Preferably I need a LoadDir method.