Services Item Management - SBOM Public APIs

Hi Community,

I have  a question related to public webservices availability related to SBOM, as i can see its not available yet on Developer assistance 26x. Though MBOM related public webservices are available. So when can we expect similar exposure of APIs for SBOM as well? or Is there any way we can get the related EBOM information from SBOM.
Also Is there any Datamodel/Conceptual model available for EBOM->SBOM, if yes please share the link/document?