How do you write ordered multi-inserts wih CTEs?

With the table like this:

CREATE TABLE test_1 (  id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY);CREATE TABLE test_2 (  id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY);CREATE TABLE test_refs (  id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,  id_1 bigint NOT NULL REFERENCES test_1,  id_2 bigint NOT NULL REFERENCES test_2);

And the insert query like this:

WITH new_test_1_rows AS (  INSERT INTO test_1  DEFAULT VALUES  RETURNING *), new_test_2_rows AS (  INSERT INTO test_2  DEFAULT VALUES  RETURNING *), test_row_pairs AS (  INSERT INTO test_refs   ( id_1, id_2 )  VALUES    (      (SELECT id FROM new_test_1_rows),      (SELECT id FROM new_test_1_rows)    )  RETURNING *)SELECT *FROM test_row_pairs

Basically what it does:

• inserts a row into test_1
• inserts a row into test_2
• inserts their IDs pair into test_refs

The problem is I would like to rewrite the query into a multi-insert query, i.e. for the n rows inserted into test_1 insert the n rows into test_2 and then create the n rows in test_refs for the inserted values. For that I need to know the row index within the CTE, so it could be used as a join key. Is it something you can do within the RETURNING clause?