Is it possible to cast to a Google Nest Hub from HA with local ip and self signed SSL cert?

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I’m running HA locally without and connection from the internet. I use VPN to connect from the outside if I want to reach HA.

I now got a Google Nest Hub that I would like to use to control HA.
I’ve read what came up googling but I can’t get it working and I’m unsure if it’s possible.
I was connected to HA using a local ip address without SSL: http://192.168.0.111:8123.
I saw that trying to access that ip from Google Chrome at https://cast.home-assistant.io/ didn’t work so I created a self signed certificate for SSL and then started running HA at https://192.168.0.111:8123.
When trying the new address in Chrome, running https://cast.home-assistant.io/,I get the error “Unknown error (TypeError: Failed to fetch)” after I tried to sign in into HA with user/password. When looking at the network traffic in Chrome the call to https://192.168.0.111:8123/auth/token fails.

I can cast the demo “Show demo” to the Nest Hub but I can’t get the HA cast to work.
The closest I get is to be able to turn the Nest hub on/off and changing the volume from HA.

Is it possible to get the cast to work in my situation (locally with ip and self signed ssl cert)?

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I have the same problem. Were you able to get around this?

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No, I wasn’t.
I think that you can open up your router so you can access your HA from the internet and then set it up with a normal certificate and then remove the internet access and have a valid certificate for 3 months, depending on the certificate.
But I haven’t tried that.
If it works then you should do some automation that will do the above to renew the certificate.