Upload SERVICE_ACCOUNT.json - config-folder with container instead of HA OS

Configuration
1

Subject says it.
I’ve tried for hours, but can’t find a way to upload SERVICE_ACCOUNT.json

I’m stuck on step 3 Enable device sync of Google Cloud Platform configuration for Google Assistant setup.

Maybe I’ve already done it. But I can’t see devices already in Google’s Home/Google’s Assistant.

Under configured, I have 1 entry under: Configured: Google Assistant SDK

NOTE: I do not have HA OS, Thus no access to the Add-on’s/apps. Thus, no SSH or samba into the HA system. Maybe there’s a backend way into the container, but isn’t there a firewall between it and the main system for a reason? In the end, I don’t see the container from the linux filesystem.

The why?
I have devices that are not showing up, but are already setup in google home. (Some are also in Alexa).

The current devices are some outlets by “HBN smart plugs”. Supposedly I can also access/add them via the tuya service, but it would require resetting them, and I don’t want to remove them from the google HOME. (nor the other devices in google’s home from alexia)

Either way, this is NOT about accessing the devices, but accessing Google Home via Google’s Assistant API

2

With google in flux toward whatever gemini is going to be away from google home, there have been reports of all kinds of undocumented changes.
Might be best to wait a couple of weeks to see what shakes out. If you manage to fix it now, the flip date is Sept 4 and it probably will change again.