[keycloak-user] SAML config using kcadmin.sh

I am currently trying to automate setup of a SAML-client using kcadmin.sh. Using 'kcadm.sh create clients -r SAML-DEMO -f saml-client.json' works when using the Keycloak-specific JSON. My SAML-Service Provider gives me a sp-metadata.xml. Using that file in the UI (Clients -> Create -> Impoert(Select File)) works and it will create a new client comntaining all the stuff provided in the XML-metadata. Sadly that doesn't seem to work with kcadmin.sh. When providing that file instead of the JSON it simply fails with 'Not a valid JSON document'. Is there a way to use the XML file from kcadmin.sh? Thanks, Jochen