How to build a web server in GCP with the Internal IP restriction

I am planning to build a back office Machine Learning Model Performance Monitoring Dashboard using Python Flask in GCP(Google Cloud Platform) with Internal (Private) IP restriction. However, when I deploy this into QV environment, the only approach I know to access the webpages is by using IAP, which is not convenient for other non-technical users.

Does anyone know what is the best practice to build a webserver for an enterprise internal use in GCP?