Hello Ed,
If you can capture the paste event on your page (e.g., through a <div> around the grid), you can get the data in C# and populate the grid Data collection with it. If you do create such an example, I'd encourage you to open a pull request with it in this repo: https://github.com/telerik/blazor-ui - we award such contributions with Telerik points and we will credit you in the readme in an appropriate manner that you prefer (you can add the credits yourself in a readme too).
The following thread offers some explanations on why the grid can't do this for you (short version: serialization of the models is not in the grid's domain):
https://feedback.telerik.com/blazor/1435743-copy-selected-row-to-the-clipboard.
Regards,
Marin Bratanov
Progress Telerik
UI for Blazor