How to expose MySQL database?

Questions
1

I installed kong using helm chart. In values.yaml I specified two TCP ports in Stream section:

stream:
- containerPort: 39019 #MongoDB
  servicePort: 39019
  protocol: TCP
  parameters:
    - ssl

- containerPort: 43576 #MySQL
  servicePort: 43576
  protocol: TCP
  parameters:
    - ssl

My intention is to expose one port for MongoDB and another for MySQL.
After that, I created a TCPIngress file for both databases:

apiVersion: configuration.konghq.com/v1beta1
kind: TCPIngress
metadata:
  name: tcp-mysql
  annotations:
    kubernetes.io/tls-acme: "true"
    cert-manager.io/cluster-issuer: letsencrypt
    kubernetes.io/ingress.class: kong
    konghq.com/plugins: global-file-log
spec:
  tls:
  - hosts:
    - s.mytest.domain
    secretName: s.mytest.domain-certificate
  rules:
    - host: s.mytest.domain
      port: 43576 
      backend:
        serviceName: mysql
        servicePort: 3306

the MongoDB TCPIngress is nearly equal, the difference is the port and servicePort that are 39019:27017 respectively.

with this configuration, MongoDB works perfect, but MySQL doesnt. I’m new to Kong and Kubernetes in general. How can I trace whats going wrong and how to solve this?