I have tried various entries and BIAB will not accept these:
Fm(add9)
Fmin(add9)
F−(add9)
Fmi(add9)
F minor add 9

Not to be a music theory snob, but I do not want Fm9 (F minor 9):
Formula: F – A♭ – C – E♭ – G

Fm add9 (F minor add 9):
Formula: F – A♭ – C – G. (No 7th)