Adding Containers to Chrome would be largely pointless - because Google anyway has access to everything. It's like adding a VPN to Android and then still using Map and everything while logged with your Google a/c. Chrome by design has no privacy.
I know many of us (if not all) are already aware of this (or something on this lines) but this is important to make this distinction when talking about Firefox and Chrome in one breath.
Comparing Chrome and Firefox when it comes to privacy is apples and oranges. I know you were not directly doing that but I still thought it is important to be noted.