Hi there,
To use the Name and space field, first, you need the space name and App Id (I assume that you have already created the app from the Google Cloud project.
If not, here is a screenshot of the app configuration in GCP.
How to get space name and App Id:
Space name is available in the URL in Google chat application :
APP id -
This you will get from Google cloud console under “enabling API and services” section after configuring the app:
Once you get both, this is how it will look like:
I hope this points you at least in the right direction. 