OIDC OP support in Shibboleth is currently supplied by a formerly third-party effort that has been donated to the Shibboleth Project. Version 2.0 of this plugin module remains documented separately, but the code has been moved to our repository and bugs may be reported to our issue tracker.
A third version of this plugin will be made available with Shibboleth IdP V4.1, and the documentation will move into the wiki at that time. This version will include breaking changes to the configuration as part of finalizing the package names of the code and the XML namespaces of the schemas used.