The Siri watch face is supposed to do this. Perhaps what we need is a Siri complication?
The Siri watch face needs better support for (or perhaps, from?) third-party apps. It only has space for one small complication. But I want to relevant information from more apps surfaced when it's relevant.
Right now, I use the Modular face with complications for weather, activity, ecobee, battery, and the large one for my calendar. The Siri face can do all that except show my ecobee's status. I'd really like to have that be a card in the stack, perhaps near the top with weather.
Likewise, I'd like to have a Siri card for Home status similar to the iPhone Lock Screen widget. Even better if it can be customized to show temperatures and humidity for specific rooms or sensors. Right now, there's no native way to bring that information from HomeKit to any face on Apple Watch.