System architecture question

I am just a beginner, but am fascinated by the possibility of using Wear OS for a healthcare related application.

Presently, it seems like Creator cannot “write” new faces directly via Bluetooth from Windows to the watch, but that one has to have a phone (Pixel 3 XL) in-between.

Is it possible that a Bluetooth-enabled sensor “device” (temperature, humidity, blood pressure…) of some sort could write directly to the smartwatch, and use it, essentially, as a user interface?

Where in the documentation stack would this kind of scenario be discussed?

Thanks so much!