Can I use Grep to control "variable header" ,and increase the word spacing when it is 2 characters?

[dublove]

Can it be achieved?
Variable brow:
If it is 2 characters, it will automatically increase the character spacing.
However, it does not affect the case of 3 or more characters.

It seems that variables are a whole and cannot be split.
I tried grep, but I didn't respond.

Or download it here for temporary storage

[Jean-Claude Tremblay]

GREP and local formating is impossible on Variables. Use Tracking in your paragraph style...