Yes, you've got it right, you can just use:
However! There are several other important things to keep in mind. What that setting actually does is just open a port on localhost. By default in GCP, the backup address is not exposed to the internet. This would be a very bad idea for security, as you don't want anyone on the internet being able to take a backup of your database. As a result, that port is only available on localhost. If you try from your work laptop to do a backup, it will fail with connection timeout errors, as GCP's firewall blocks inbound traffic on this port.
The 0.0.0.0 part means the machine will listen on all interfaces, but practically speaking since yours will only have one, this means it will listen on the internet interface, probably a
10.*.*.* address inside of google.
To take a backup, you must SSH into the machine and run the backup locally, then copy the backup off machine somewhere else, like google storage.