Automatic UI updates with Blazor

Starting with the new .NET 8 Blazor WebApp template, I hope to build an application whose pages automatically send updates to all users. For example, when Joe adds a payment to an invoice, Sue (who is viewing the same invoice) should see the new balance reflected on her screen the moment Joe clicks the Save button.

Will this be possible without wiring up a special SignalR hub for each page/component? I've read that Blazor uses SignalR under the hood, so I'm hoping this can be accomplished without a lot of complex (and error-prone) extra work.