How to capture the celery warning(s) from logs?

I am using celery in conjunction with fastapi & the results are being logged in a file called celery.log via the command

celery worker --app=app.celery_worker.celery --loglevel=info --logfile=app/logs/celery.log

When the code is triggered, the logs are written in the celery.log file as follows:

[2022-05-20 11:38:35,148: INFO/MainProcess] Received task: kwept_calculation[bd80737a-92cd-4fea-8a68-c010d5ab3ed3]  
[2022-05-20 11:38:46,249: WARNING/ForkPoolWorker-7] System mit Neuinstallation(en) nicht betreibbar (z.B. wegen nicht deckbarer Wärmenachfrage)
[2022-05-20 11:38:53,401: WARNING/ForkPoolWorker-7] System ohne Neuinstallation(en) nicht betreibbar (z.B. wegen nicht deckbarer Wärmenachfrage)
[2022-05-20 11:38:53,402: ERROR/ForkPoolWorker-7] Task kwept_calculation[bd80737a-92cd-4fea-8a68-c010d5ab3ed3] raised unexpected: UnboundLocalError("local variable 'kpis_df' referenced before assignment")
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/celery/app/trace.py", line 412, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/celery/app/trace.py", line 704, in __protected_call__
    return self.run(*args, **kwargs)
  File "/kwept/app/celery_worker.py", line 77, in calculation
    created_at_ts
  File "/kwept/app/services/planning_calc.py", line 571, in plan_calc
    kpis_df.reset_index(drop=False, inplace=True)
UnboundLocalError: local variable 'kpis_df' referenced before assignment

To get the info on the task, I do

from celery.result import AsyncResult
task_result = AsyncResult(task_id) # in the above case bd80737a-92cd-4fea-8a68-c010d5ab3ed3
task_info = task_result.info

When I do that, the error from the above task_info is captured

local variable 'kpis_df' referenced before assignment

Is there a way to capture the warning messages? In the above example, the warnings are:

System mit Neuinstallation(en) nicht betreibbar (z.B. wegen nicht deckbarer Wärmenachfrage)

and

System ohne Neuinstallation(en) nicht betreibbar (z.B. wegen nicht deckbarer Wärmenachfrage)

from How to capture the celery warning(s) from logs?