How do I block private numbers from calling me?

Android 7 on a motorola E4. This does not work for me as I simply don't have that menu. How do I block private numbers from calling my phone? I'm not looking for a 3rd party application. I'm thinking there must be some way to do this on an android level, maybe with some hidden code ? The phone isn't rooted, ADB isn't an option since data over USB on the phone is broken.