You are using data fields with custom namespaces, but these fields are ignored during XMP export activities. The "imageconvert" trigger action has "copy existing XMP" set, but the custom namespace is not copied. The custom namespaces are not included when using the Basket plugin to download compressed archives of files with the "XMP Export" function.
Data fields with custom namespaces are not exported in the XMP metadata unless those namespaces have been configured in Xinet.
Reference Creating Custom XMP Namespaces to add your custom namespace to the XMP.conf file of your Xinet installation.
After defining the custom namespace, reference Testing a Newly Added XMP Namespace. Once added, you should now see the data fields within the XMP metadata export.