What is your question?
I just installed the v2 version of WAC.
In the original I would see a list of extensions, one of which is called the container extension.

https://learn.microsoft.com/en-us/virtualization/windowscontainers/quick-start/set-up-environment?tabs=dockerce#windows-admin-center
I see here you can install extensions from custom feeds. Is there a feed for the container extension?
https://learn.microsoft.com/en-us/windows-server/manage/windows-admin-center/configure/using-extensions#installing-an-extension
What is your question?
I just installed the v2 version of WAC.
In the original I would see a list of extensions, one of which is called the container extension.
https://learn.microsoft.com/en-us/virtualization/windowscontainers/quick-start/set-up-environment?tabs=dockerce#windows-admin-center
I see here you can install extensions from custom feeds. Is there a feed for the container extension?
https://learn.microsoft.com/en-us/windows-server/manage/windows-admin-center/configure/using-extensions#installing-an-extension