How to config the nested PageMethods into Request?

[sick-pupil]

for headline in page.locator("//div[contains(@class, 'headline') and contains(@class, 'clearfix')]").all(): 
        headline.scroll_into_view_if_needed()
        page.wait_for_timeout(2000)

How to config the nested methods into Request(url=..., meta={'playwright_page_methods': [...]})

[sick-pupil]

async def parse(self, response):
    page = response.meta['playwright_page']

    for headline in await page.locator("//div[contains(@class, 'headline') and contains(@class, 'clearfix')]").all():
        await headline.scroll_into_view_if_needed()
        await page.wait_for_timeout(2000)

    logging.info(await page.content())

    with open(file = os.path.join(self.screenshot_path, 'anime', '{}_{}_screenshot.html'.format('anime', self.current_timestamp)), mode = 'w', encoding = 'utf-8') as f:
        f.write(await page.content())

    selector = Selector(response = page.content())
    ...