I would suggest looking into supporting Blazor client-side programming with ServiceStack, at least a C# client that works with the ServiceStack cli (https://docs.servicestack.net/csharp-client).
Johan Mulder commented
Starter template with Blazor authentication/authorization integrated into SS. Also a working SS Httpclient + SSE example.
George Hemmings commented
I'm also hoping for Blazor Server support. This could be just a SS ComponentBase with templates for integration with SS Auth.