Is there any way to pass any type into cython and get return wholly intact?

I got a compute intensive task which does some filter job for many times.

Things like this:

# (a large dictionary with a length of about 1m , value could be any python type , keys are all strings.)
dictionary = {'a':1 , 'b':[] , ...} 

for i in range(1e6):
    Filtered(dictionary, 'b') # -> which is expected to return [] in this particular case. 

And I would like to take advantage of cython. Got a problem here is if there's any way to convert this python sturcture into c style , if there're some kind of pointer that can points to any python object , so that I can simply get input and return stuff intact to simply solve this problem?

Expect something like this:

cdef filter(pydictionary , pystr):
    cdef map[void *] dictionary = pydictionary
    cdef string str = pystr

    # ... some filter stuff
    
    result = dictionary[str] 
    return result

Is that possible to achieve? Thanks.