Sometimes complicated is clearer

await page.screenshot(path="ss_0.jpg")
await asyncio.sleep(1)
await page.screenshot(path="ss_1.jpg")
await asyncio.sleep(5-1)
await page.screenshot(path="ss_5.jpg")
await asyncio.sleep(10-5)
await page.screenshot(path="ss_10.jpg")
await asyncio.sleep(20-10)
await page.screenshot(path="ss_20.jpg")