Kubernetes Ingress/Service set up

I am trying to achieve calling endpoints from my GKE flask app from my website. I have been trying but can't achieve it. I have set up DNS, ingress and loadbalancer for ingress. But I am struggling with cert-certificate. I don't really care the method. What I need to achieve is for my website to send requests to my app in GKE

I am looking for a Kubernetes expert to help me set up the Ingress/Service for my project on Google Kubernetes Engine (GKE).

Requirements:
- Experience with Google Kubernetes Engine (GKE)
- Knowledge of Ingress and Service configuration in Kubernetes
- Ability to set up external access for services

Please provide examples of your previous work with Kubernetes and GKE.