How to authenticate Microsoft Teams User to call an Agent 365 deployed directly on GCP Cloud Run?

[marco-gcp]

Good morning to everyone,
I kindly ask if there is a way to authenticate automatically (e.g. via Workload Identity Federation) Microsoft Teams User to call a GCP Cloud Run Agent 365 without having to deploy a "Python Proxy Runtime" in Azure Tenant?. The scenario shoud be as the following:

Google Cloud Run documentation shows the following authentication flow but I don't have a library, I have Microsoft Teams only:

If it is a well known scenario could someone link me the related documentation?

Thanks in advance to everyone for your help.