[Python] Locating an iframe in a closed shadow root

I am making a program that bypasses the cloudflare "Verify that you are human" check using Python, Selenium (and some javascript). The problem is that the checkbox element is located in a closed shadow root that's located in an iframe, that's located in a closed shadow root. The structure can be seen here by inspecting the checkbox.

So far, I managed to get into the first (outer) shadow root but cannot access the iframe in it.

This is my code:

from time import sleep
from selenium import webdriver
from selenium.webdriver.common.by import By

driver = webdriver.Chrome()

# Inject script to force shadow DOMs open
driver.execute_cdp_cmd('Page.addScriptToEvaluateOnNewDocument', {'source': """
Element.prototype._attachShadow = Element.prototype.attachShadow;
Element.prototype.attachShadow = function () {
return this._attachShadow( { mode: "open" } );
};
"""})

# open the site
driver.get("https://annas-archive.org/slow_download/c9cc2ebc974bb1955881807bdca7807d/0/0")

# wait for the page to load properly
sleep(3)

# Access the outer shadow DOM
outer_shadow_host = driver.find_element(By.CSS_SELECTOR, '#JStsl2 > div > div')
outer_shadow_root = driver.execute_script('return arguments[0].shadowRoot', outer_shadow_host)

# locate the iframe
iframe = outer_shadow_root.find_element(By.CSS_SELECTOR, "#cf-chl-widget-xn7qb")

# Switch to the iframe
driver.switch_to.frame(iframe)

# Access the inner shadow DOM
inner_shadow_host = outer_shadow_root.find_element(By.CSS_SELECTOR, 'body')
inner_shadow_root = driver.execute_script('return arguments[0].shadowRoot', inner_shadow_host)

# Find and interact with the target element inside the inner shadow root
target_element = inner_shadow_root.find_element(By.XPATH, '//input[type="checkbox"]')
target_element.click()


To locate the iframe element I have tried:

• Using By.TAG_NAME and By.XPATH
• Making the element visible with the following line of code: driver.execute_script("arguments[0].style.display='block'; arguments[0].style.visibility='visible';", iframe)

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