1,029 votesMike R commented
This is actually just the opposite of what I was looking for. I'm hesitant to put OneDrive on my Pixel for the very reason that I want to ensure the data is inaccessible by other apps. It is a huge security concern that my sensitive data would be exposed to any app with the 'Storage' permission.
But every use case is slightly different...
So as a suggestion for how to implement the above request; could it be potentially possible create a DMZ folder similar to how a router can assign unique permissions for a single LAN connection?