Equivalent of Forge External Authentication for Data Center Plugins?

Is there an equivalent of Forge External Authentication for the development of Jira/Confluence Data Center plugins? My use case is generating tokens from an external authentication service (Keycloak, Okta, Auth0, etc) and using these tokens to make API requests against an external REST API service from within a Data Center plugin.

The closest I could find from available documentation is here: Configure an outgoing link | Administering Jira applications Data Center and Server 9.3 | Atlassian Documentation

But, there doesn’t seem to be any information on how to access outgoing links from the Atlassian Plugin SDK or similar tools.

Any help or advice would be appreciated!