Nah - create new shortcut with launch parametr
-showFramerate
or
-showFramerateMini
For MS Store
C:\Users\userid\AppData\Local\Microsoft\WindowsApps\Microsoft.FlightSimulator_8wekyb3d8bbwe\FlightSimulator.exe -FastLaunch -showFramerateMini
Options:
-FastLaunch (for fast launch)
-showFramerateMini (to show only the FPS on the top right corner of the screen)
Make a text file.
Save as a bat file.