Automatically create CPT with month labels

I made the following figure where the data is colored based on months-data as can be seen from the colorbar. I create the cpt with this commands:
gmt makecpt -Crainbow -T1/12/1 -F+cJan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec -H > a.cpt

I have to write the abbreviated name of each month. Is there an automatic way to do this? Something like -F+c"Month" ? Should I request the feature?

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Yes, please make a feature request. I will think about what is the best syntax for this and similar situations (days, hours).