shadow-rootで囲まれたテキストボックスのスクレイピング方法について

 searchBox = shadow_root. find_element(By.CSS_SELECTOR,"form > input")
AttributeError: 'dict' object has no attribute 'find_element'

from selenium import webdriver
from selenium.webdriver.common.keys import Keys as keys
from selenium.webdriver.common.action_chains import ActionChains
from webdriver_manager.chrome import ChromeDriverManager
from selenium.webdriver.common.by import By
from selenium.webdriver.chrome import service
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.by import By

import time
import statistics
import chromedriver_binary


def mercariPriceCalc(url,procuctNames):
    #ChromeDriverのテンプレ
    driver = webdriver.Chrome()
    driver.implicitly_wait(10)
    driver.get(url)

    #2秒待機
    time.sleep(2)
    #返却用の平均価格マップ｛商品名：平均価格｝
    AveragePrice = {}

    for procuctName in procuctNames:
        element = driver.find_element(By.CSS_SELECTOR,"#gatsby-focus-wrapper > div > div > header > mer-navigation-top > mer-autocomplete > div:nth-child(1) > mer-search-input")
        shadow_root = driver.execute_script('return arguments[0].shadowRoot', element)
        searchBox = shadow_root. find_element(By.CSS_SELECTOR,"form > input")
        searchBox.sendKesy(productName)

以下複数記事を参考にし、ドライバーのバージョンやpythonのバージョン、chromeのバージョン変更しましたが改善せず