Since 2017, the RDA VSSIG’s Ontology Metadata task group studies the question of metadata descroption for ontologies or semantic resource/artefacts in general.
For a latest presentation of the activities of the group see here:
https://drive.google.com/file/d/1V6BD9UJG6TmZUBQ9SE7hbK-bJFI5amCg/view?u...
Work by the RDA VSSIG’s Ontology Metadata task group inculde: