At this time Okta does not support imports of Metadata. We have an option you can use which is the Application Integration Wizard. The Application Integration Wizard you can use to configure SSO applications with Okta the IdP and the Service Provider. We do support exports of Metadata in some cases. Here is a KB article about Okta's Application Integraton Wizard - https://support.okta.com/help/Documentation/Knowledge_Article/Using-the-App-Integration-Wizard-1111708899.