Postgres natively partitioned tables - adding extra child columns

With Postgres native partitioning, can you add extra columns to a partition of the base table? Like:

CREATE TABLE item (
  tenant_id bigint NOT NULL,
  item_id   bigint NOT NULL,
  kind      text NOT NULL CHECK ( kind IN ('product', 'ingredient') ),
  PRIMARY KEY (tenant_id, item_id)
) PARTITION BY LIST (kind);

CREATE TABLE item_product PARTITION OF item (
  extra_sku TEXT
) FOR VALUES IN ('product');

CREATE TABLE item_ingredient PARTITION OF item
FOR VALUES IN ('ingredient');

The [CREATE TABLE] syntax doesn't seem to support adding columns on child tables, only adding constraints to existing columns, so I'm guessing it's not allowed.