Hello Craig,
CSP compliance for the Spreadsheet component is a big and complex task that will require considerable changes to our JavaScript code. This is due to the nature of the Spreadsheet and how we use function evaluation now.
We have started working on this initiative recently, but there is no specific time frame for a release yet. It will surely take months and the changes may take effect in 2025. All this is preliminary unofficial information.
In the meantime, if strict CSP compliance is an absolute must, then the remaining option is to download our source code and rebuild the telerik-blazor.js file without the Spreadsheet scripts. You will need to perform this procedure after every component version update.
On a side note, I edited the title of this feature request to be more specific.
Regards,
Dimo
Progress Telerik