I Want to create finger input shortcut

Hi, is there anyway to create finger shortcut for left or right fingering? Like L5 or R2

Yes, exactly as you suggest, when writing for keyboard, you can prefix the finger number you input with L or R. Note that this will not, however, cause the fingering to appear on the other staff, but it will mark the fingering as belonging to the other hand. For more information about inputting fingering, please see here.