The Brick type fieldgroup is used to display data as a Brick and is a table property and cannot be extended. If we want to use an existing table but want to use different fields in the Brick, there is no way for us to do this. Also sometimes the fields we want to show may be different depending on the page context.

We should be allowed to specify a fieldgroup(Brick... property on a list page or page extension which will override the standard property on the table.