Need help with notification groups, documentation seems to be lacking?

I need to apparently set up a notification group for frigate alerts, all I want to do is add two devices to be notified on an alert.

Per the blueprint page, I need a group.

The documentation provided here says "We don’t recommend using these old-style groups anymore", and then has nothing in the way of contents for setting up a notification group with regular companion app devices (something about html5 action?...). I tried using chatgpt to give me an example (I know) but it decided to use the old format.

Does anyone have an example of two companion app devices in a notification group?