cannot route url - AdditionalAssemblies in app.razor - blazor web app

[tinikook]

blazor web App
in .net 8 review 5 i can't use AdditionalAssemblies in app.razor file.
specifically :
Router AppAssembly="@typeof(App).Assembly" PreferExactMatches="@true" AdditionalAssemblies=new[] {assembly}.
the router doesn't seem to find the site in RCL

[javiercn]

@tinikook thanks for contacting us.

There are APIs to manually register additional endpoints when calling MapRazorComponents, and we will be automatically discovering pages from referenced assemblies in a future preview.

[mkArtakMSFT]

Thanks @javiercn.
Here is the issue tracking the remaining work here: #48767

[danroth27]

There are APIs to manually register additional endpoints when calling MapRazorComponents

@javiercn What are these APIs? How do you register additional endpoints from other assemblies when calling MapRazorComponents?