Hi Rob,
We have considered to implement this WPF platform support for Xamarin.Forms DataGrid. We will implement the same in any of our upcoming Volume release.
At the planning stage for every release cycle, we review all open features and identify features for implementation based on specific parameters including product vision, technological feasibility, and customer interest. We will let you know when this feature is implemented.
You can track the status of the report by the following feedback link,
Thanks,
Rachel.