We have not yet investigate Blazor in detail. Based on information available online, Blazor is a class of new .NET web frameworks. Initially, it contains at least two different frameworks - Blazor running on Server, and Blazor running as a WebAssembly. The Blazor on Server is introduced in .NET Core 3, while Blazor running as a WebAssembly has not yet formally released.
At the moment, we will probably wait until Blazor is more mature before we will consider it.
As we have not tried it yet, we are not sure if the current ChartDirector ASP.NET Core support can be used with Blazor.