Вот способ сделать это:
import bs4
your_source_code = "<html>..."
soup = bs4.BeautifulSoup(your_source_code, "html.parser")
result = {}
for group in soup.find_all("div", {"class": "details-feature-list--normalized-features"}):
result[group.find("h2", {"class": "cui-heading-2"}).text] = [itm.text for itm in group.find_all("li", {"class": "details-feature-list__item"})]
Результат - это как:
{"Convenience": ["Remote Start", "Navigation System", "Heated Steering Wheel"]}