Changing timestamp on summary index

Getting Data In

I am running a Summary Index based on a lookup table. However I want to change the summary index timestamp to "Month/Year" field (see below).

| inputlookup inventory.csv
| stats values(count) as count by Month/Year Month FamilyCod ProductCod

Month/Year field is in following format "%Y/%m". Could someone please advise?

Tghanks

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