I need help writing a filter.  I want to pre-filter a vector index before performing a hybrid search and create this as a function.  Below is a simple example of searching for products for a given customer.  A prefilter is key as this provides authorizations for searching a vector index before applying the top k which reduces the vector space searching as a prefilter before the search.  I am not seeing any filter capability like how you would call the API.
Example of the search API with prefilter

results = index.similarity_search(
   query_text=question,
   query_type = "HYBRID",
   columns=["content", "product", "product_description", "product_id", "purchase_date"],
   filters="{"customer_emai":customer_email},
   num_results=5
)

Below is the SQL Function I need help on