SpiceDB is an open source, Google Zanzibar-inspired, database system for creating and managing security-critical application permissions.

SpiceDB

Do you mean the above syntax is just a wrapper for

WriteRelationshipsRequest(
    updates=[
        RelationshipUpdate(
            operation=RelationshipUpdate.Operation.OPERATION_CREATE,
            relationship=Relationship(
                resource=ObjectReference(object_type="blog/post", object_id="1"),
                relation="writer",
                subject=SubjectReference(
                    object=ObjectReference(
                        object_type="blog/user",
                        object_id="emilia",
                    )
                ),
            ),
        )
    ])

that parses resource/subject arguments, extracts object_type/object_id from them and ultimately calls WriteRelationshipsRequest?