Thanks again for contacting Google Play Developer Support.
First, I apologize for misunderstanding your query about app category.
I understand now that you’d want to include or list your app under the section WATCH_FACE (https://play.google.com/store/apps/category/WATCH_FACE).
I checked into it and the Play Console doesn’t currently support listing or including your app in this category. Luckily, we place a high value on developer feedback, and I’ll be sure to pass along your specific feedback to our product team. We’re continually adding new features and functionality, so please stay tuned.
If you’d want to feature your app in this section, please kindly contact our Google Play Support team for further assistance.
Please let me know if you have any other questions or concerns about the Play Console.