### Add below stanza to your ~/.ssh/config
## Parsed as vmname.REGION.PROJECT.gcp
Host *.*.*.gcp
        ProxyCommand gcloud beta compute ssh --tunnel-through-iap $(echo %h|awk -v FS=. '{ printf ("--project=%%s --zone=%%s %%s", $3, $2, $1) }') --command="nc -q0 localhost 22"