Launching Cast from a Google Nest Hub Max?

Hi all,

I’m not totally following the cast integration. It seems the only way I can bring up a “cast” of Home Assistant is to get on another device, visit https://cast.home-assistant.io/, activate the cast, and then send it to the cast display.

I believe I can create an entity card, that would allow me to do it without visiting the site above, but the documentation for that doesn’t actually have an “entity” card definition. It looks more like something that would be in the configuration.yml

Is there a way, from the cast device itself, to “open” Home Assistant?

Thanks!

Also, is there a way to pick a theme vs the default light theme?

Same question here… I’d really like to be able to launch cast directly from my Nest Hub.
Thanks