Парсинг ::before with BS4 (псевдо-класс)

url = 'https://kant-sport.ru/sports/skiing/svobodnoe-katanie/'
 
# Getting whole page
page = get(url)
 
# Making soup
soup = BS(page.content, 'html.parser')
 
# Getting table
table = soup.select('.new-tables-content')[0]
 
# Getting table's rows and getting rid of first unneeded row
rows = table.select('.new-tables-content-row')[1:]

# Getting 'x' symbol by class
print(rows[0].find(class_="new-tables-content-col::before"))

None

# Getting 'x' symbol by css
print(rows[0].select('.new-tables-content-row:not(.new-tables-content-header) .new-tables-content-col:last-child:before'))

Traceback (most recent call last):
  File "E:/Coding/PycharmProjects/kant-monitoring-bot/parser.py", line 36, in <module>
    print(rows[0].select('.new-tables-content-row:not(.new-tables-content-header) .new-tables-content-col:last-child:before'))
  File "E:\Coding\PycharmProjects\kant-monitoring-bot\venv\lib\site-packages\bs4\element.py", line 1869, in select
    results = soupsieve.select(selector, self, namespaces, limit, **kwargs)
  File "E:\Coding\PycharmProjects\kant-monitoring-bot\venv\lib\site-packages\soupsieve\__init__.py", line 98, in select
    return compile(select, namespaces, flags, **kwargs).select(tag, limit)
  File "E:\Coding\PycharmProjects\kant-monitoring-bot\venv\lib\site-packages\soupsieve\__init__.py", line 62, in compile
    return cp._cached_css_compile(pattern, namespaces, custom, flags)
  File "E:\Coding\PycharmProjects\kant-monitoring-bot\venv\lib\site-packages\soupsieve\css_parser.py", line 208, in _cached_css_compile
    CSSParser(pattern, custom=custom_selectors, flags=flags).process_selectors(),
  File "E:\Coding\PycharmProjects\kant-monitoring-bot\venv\lib\site-packages\soupsieve\css_parser.py", line 1043, in process_selectors
    return self.parse_selectors(self.selector_iter(self.pattern), index, flags)
  File "E:\Coding\PycharmProjects\kant-monitoring-bot\venv\lib\site-packages\soupsieve\css_parser.py", line 902, in parse_selectors
    has_selector, is_html = self.parse_pseudo_class(sel, m, has_selector, iselector, is_html)
  File "E:\Coding\PycharmProjects\kant-monitoring-bot\venv\lib\site-packages\soupsieve\css_parser.py", line 640, in parse_pseudo_class
    "'{}' pseudo-class is not implemented at this time".format(pseudo)
NotImplementedError: ':before' pseudo-class is not implemented at this time
 
Process finished with exit code 1