Get Blazor Webassembly component to respond to .net events from project Library

Question

Working in #Blazor Webassembly, I have an added project Library. This Library works in the background to updates a data structure with data. When that happens, I want to push the change to the Razor component and have it do, I think, a StateHasChange. Using a button in the component that calls StateHasChange works, but is a pull flow. In the simplest way possible, how would I get that to be called in response to a push flow? My current thinking is the library issues a .net event or observable. So the razor component would need to subscribe or observe the library publisher. I have explored the EventCallback in Blazor but I am not sure this is the correct path do to my noviceness with Blazor and events in general. The Library is #fsharp but could be #csharp just the same. The stumbling block is how to get the Blazor component to be a subscriber. The idea of a service has been seen, but I am still not sure if that will allow the push update I am seeking. Any simplest examples or advice?