I've created https://github.com/freeipa/freeipa/pull/6689. Once it's merged and the change is available downstream, we should provide an updated output from "ipa idp-add" and "ipa idp-show" commands.

Reported by: rhn-support-tscherf

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_identity_management/assembly_using-external-identity-providers-to-authenticate-to-idm_configuring-and-managing-idm#annotations:d160a18b-9c4c-4ca5-b8a3-394256533387