Query MySQL database with Python using sshtunnel, with SSH ppk key file

I have been able to sshtunnel into a remote database via the following code utilizing passwords

import sshtunnel
import mysql.connector
import numpy as np
import pandas as pd

host =""
username=""
password=""
tunnel_username=""
tunnel_password=""

with sshtunnel.SSHTunnelForwarder(
    (host, 22),
    ssh_username=username,
    ssh_password=password,
    remote_bind_address=('localhost', 3306),
    local_bind_address=('0.0.0.0', 3306)
) as tunnel:
    connection = mysql.connector.connect(
    user= tunnel_username,
    password= tunnel_password,
    host='localhost',
    database= database,
    port=3306)
    data = pd.read_sql_query(query, connection)
    connection.close()
    print(data)

However, circumstances have changed, and I have been forced to only connect via SSH keys (generated with PuTTYgen). With that being said, I have the private key (ppk file), but it is unclear what I need to do (or if possible) to get the following code to work again.

I have not seen an option to reference the ppk file path instead of the sshtunnel password.