Override property inherited from composition

[bjarnef]

Compositions are great as building blocks and benefits when using ModelsBuilder as interfaces are generated. So it is easy to pass in the the model to a partial and check the current page has the composition.

E.g.

@if (Model is ISidebar sidebar && sidebar.IsVisible())
{
     <div>@await Html.PartialAsync("Sidebar", sidebar)</div>
}

However a limitation of this is that properties like label, description and setting to property to mandatory is also inherited.
Maybe we can't change part of the inherited properties like datatype and alias, but it would be useful to override label and description to customize this to the specific page type or e.g. set the property as mandatory, while it shouldn't be mandatory on another page.

[steveatkiss]

This would be really helpful in some cases, for example, when recommended image sizes are different for different doc types (and their templates), it would be useful to set a specific label for each case but still inheriting a standard "Image" property as part of a standard set of properties for a page.