Is CMAQ-ISAM possible to tag for Particle Number variable (NUMATN, NUMACC, or NUMCOR)?

I am curious if CMAQ-ISAM can tag for particle numbers.

In the isam_control.txt file,
I can choose only 9 options.
e.g. !!! Choose any/all from the list of nine: SULFATE, NITRATE, AMMONIUM, EC, OC, VOC, PM25_IONS, OZONE, CHLORINE

Should I change SA_DEFN.F to tag a new variable?

Best regards,