1. Generate SSH config file using gcloud command line

gcloud compute config-ssh

https://cloud.google.com/sdk/gcloud/reference/compute/config-ssh

You cant get ssh config for your Google Compute Engine project!

Notice: you need choose target GCP project before run below command.

gcloud config set project <your-project-id>

2. Install Remote SSH extention in Visual Studio Code.

https://code.visualstudio.com/blogs/2019/07/25/remote-ssh

3. Press ⇧⌘P & Select target connection in Visual Studio Code!

Finaly you can connect in Visual Studio Code. Welcome to VS code when you write the code in SSH connection.