volatile mutation db function with affected_row count

[ahamid]

Hello, I'm wondering if it is possible to obtain the affected_row count for mutating (volatile) db functions tracked by Hasura?
It does not seem these fields are generated as they are for tables.

e.g.

CREATE TABLE public."Item" (
  id uuid DEFAULT public.gen_random_uuid() NOT NULL,
  updated boolean DEFAULT false NOT NULL,
)

CREATE OR REPLACE FUNCTION public.fn_update_items() RETURNS SETOF public."Item" as $$
BEGIN
  RETURN QUERY UPDATE public."Item" set updated = true
    RETURNING *;
  RETURN;
END;
$$ LANGUAGE plpgsql;