How can I get a tqdm progress_apply bar in vscode + python jupyter extension?

I am trying to display a progress bar when I perform "vector"progress_apply operations on pandas dataframes, in MS Visual Studio Code.

In VS Code with the Python extension enabled, I tried in a cell

import pandas as pd 
from tqdm import tqdm_notebook, tqdm_pandas 

tqdm_notebook().pandas()

df = pd.DataFrame({'a' : ['foo', 'bar'], 'b' : ['spam', 'eggs']}) 
df.progress_apply(lambda row: row['a'] + row['b'], axis = 1)

And the result is

and the progress bar is not rendered. I would like a progress bar to render a bit like it happens with

from tqdm import tqdm

for i in tqdm(range(len(df))):
    pass

I am puzzled because the syntax above works fine in "classic" Jupyter notebooks on Firefox

How can I visualize the progress bar when I run pandas progress_apply in vscode?