Copilot AI's Agent Mode in Word and for Excel is available to subscribers who sign up for Microsoft's Frontier program.
The best way to do this is by converting your data to an Excel table. Select your data range (A1:E11), press Ctrl + T, and click OK. Excel names it something like "Table1"; in my case, it's Table3, ...
Combining Ctrl + Shift + Arrow keys lets you extend your selection in any direction until Excel hits a blank cell. Start from the top-left corner of your data, try Ctrl + Shift + Right Arrow, then ...