WITH pgrst_source AS (
  INSERT INTO "test"."complex_items"("arr_data", "field-with_sep", "id", "name")
  SELECT "pgrst_body"."arr_data", "pgrst_body"."field-with_sep", "pgrst_body"."id", "pgrst_body"."name"
  FROM (SELECT '[{"id": 4, "name": "Vier"}, {"id": 5, "name": "Funf", "arr_data": null}, {"id": 6, "name": "Sechs", "arr_data": [1, 2, 3], "field-with_sep": 6}]'::json AS json_data) pgrst_payload,
  LATERAL (SELECT CASE WHEN json_typeof(pgrst_payload.json_data) = 'array' THEN pgrst_payload.json_data ELSE json_build_array(pgrst_payload.json_data) END AS val) pgrst_uniform_json,
  LATERAL (SELECT "arr_data", "field-with_sep", "id", "name" FROM json_to_recordset(pgrst_uniform_json.val) AS _("arr_data" integer[], "field-with_sep" integer, "id" bigint, "name" text) ) pgrst_body
  RETURNING "test"."complex_items".*
)
SELECT
  '' AS total_result_set,
  pg_catalog.count(_postgrest_t) AS page_total,
  array[]::text[] AS header,
  coalesce(json_agg(_postgrest_t), '[]') AS body,
  nullif(current_setting('response.headers', true), '') AS response_headers,
  nullif(current_setting('response.status', true), '') AS response_status,
  '' AS response_inserted
FROM (SELECT "complex_items".* FROM "pgrst_source" AS "complex_items") _postgrest_t;