Assuming that you mean a grid control like Excel, then that is not something you will find in the box for .NET MAUI, not for the preview, but also not for the final version.
Depending on what you want to achieve you might want to reconsider how you are representing your data or consider getting pre-made controls from vendors like Telerik or SyncFusion.
Update: Reading this again I might've misunderstood your question, sorry about that. A control like that won't be available with .NET MAUI, but of course you can create a custom control if that's what you like. The Grid
probably is a great starting point, but that will only provide the layout with read-only data. If you want to extend it beyond that you will have to gain knowledge about how to create custom controls for .NET MAUI