CustomMetadataProperty Id.
CustomMetadataProperty value. Polymorphic per property type: scalar (String/Float/Int/DateTime) for single-value types; list of Int option IDs for MULTISELECT; for CATALOG, a non-empty list of entry objects of the shape [{"rowId": 123, "children": [{"rowId": 456, "sourceColumnId": 789}]}, …] — the server creates a CatalogSelection and persists its ID transparently.