XML representation of "User Attribute" in SAML client import for Keycloak

Getting advice
1

I am attempting to import an SAML client into Keycloak using an XML file that includes certain mappers. The XML file contains the following mappers:

<md:AttributeConsumingService index="0">
  <md:ServiceName xml:lang="fr">test 1</md:ServiceName>
  <md:ServiceDescription xml:lang="fr">test 1</md:ServiceDescription>
  <md:RequestedAttribute NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri" Name="urn:oid:0.9.2342.19200300.100.1.3" FriendlyName="mail" isRequired="true"/>
  <md:RequestedAttribute NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri" Name="urn:oid:2.5.4.42" FriendlyName="givenName" isRequired="true"/>
</md:AttributeConsumingService>

However, when importing these mappers into Keycloak, the “User Attribute” value for each mapper is empty.

Alternatively, when using a JSON file and adding the “user.attribute” option, the “User Attribute” value is correctly populated. Here is an example of the JSON representation:

"protocolMappers": [
  {
    "name": "urn:oid:0.9.2342.19200300.100.1.3",
    "protocol": "saml",
    "protocolMapper": "saml-user-attribute-mapper",
    "consentRequired": false,
    "config": {
      "attribute.nameformat": "URI Reference",
      "friendly.name": "mail",
      "attribute.name": "urn:oid:0.9.2342.19200300.100.1.3",
      "user.attribute": "mail"
    }
  },
  {
    "name": "urn:oid:2.5.4.42",
    "protocol": "saml",
    "protocolMapper": "saml-user-attribute-mapper",
    "consentRequired": false,
    "config": {
      "attribute.nameformat": "URI Reference",
      "friendly.name": "givenName",
      "attribute.name": "urn:oid:2.5.4.42",
      "user.attribute": "givenName"
    }
  }
]

In the JSON representation, the “User Attribute” field takes the value of “user.attribute” in Keycloak.

My question is: How can I represent the “User Attribute” in XML so that Keycloak can process it correctly and populate the value?

Thanks in advance