I'm new to gRpc and now learning this tech

I'm wondering if gRpc can replace SignalR for updating notification bar on my client-side app (React).
Is that the case? or should I keep using SignalR for this matter?

(I'm asking it just to make sure I understand the purpose of the gRpc tech, by few articles I read it's more a web API replacement and few others compare it to SignalR)

Thanks!
y-me