Help Needed: To fetch total number of matching results

Hi Guys,
I am exploring LangChain, and stuck at one issue, Needed your help!!

I am trying to get total number of empty parking spots available in csv, but I see we can only define k value in retriever,

Is there a way to ignore k value and give full matching result ?

Here is my code: Langchain/apps/find_parking/parking_spots.ipynb at main · DastanIqbal/Langchain · GitHub


This is my code

Thanks !!