Dante63, I have some new developments and information relevant to this. I installed the Dexcom G6 app to my phone (Pixel 2 XL w/ LineagOs 19.1 Android 12) and used Wear Installer 2 to install the embedded Dexcom watch face to my GW4. It did not work. A YouTube video said give it file and media access permissions on the watch, which didn't help. Upon googling the subject, I found this Reddit
discussion, which details a method that did work, (see attached pic). The the chart and blood glucose info is great but the few other items included are very small (and I have the 44mm version.) Not very good use of the watch face real estate. It also says that it creates a complication that can be included on other watch faces. i have your Material Design Digital Clock face and the right 55% of the screen is just used for the easily read current time. Perhaps with a rotation to the top part of the screen there would be room for current time, bG reading with trend arrow and the weather, a truly information packed watch face. The bG chart is really not as important as the current reading.
View attachment 5778211