See this Play Store Guide
I created a very simple pdf that basically answers the three question you thought. We do not store, collect, use or share any of your personal data. The guide will tell you everything that needs to be included. Then you publish that on your web site or a shared site like Google Drive. And include the URL on your submission form when you upload to play store.
Don’t worry about complications or anything if they share information it is for that app to ask or inform of any sharing not the watch face app.
No I just made it up in Word and saved as PDF but you can do a read only Google docs page.
Just 3 questions you have to answer and post it online. Put the URL when you upload your app.