When is Spreadsheet for Blazor available or can i use Kendo Spreadsheat?
I moved this ticket to the public Feedback portal so you can Follow the status of such a component. Here's a link so you can find it easily: https://feedback.telerik.com/blazor/1442151-spreadsheet-component.
In the meantime you can use another component such as the Kendo jQuery Spreadsheet. The following KB article shows the basics of such an approach: https://docs.telerik.com/blazor-ui/knowledge-base/jquery-kendo-in-blazor.