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Adding market capitalization to Zipline Bundle

Hi all,

I have access to a data source that that provides daily short interest and outstanding shares numbers. I've implemented a custom bundle using an extension (register the bundle, ingest it), but I would like to add a field to the data store. I believe that all of the columns for the pricing data are contained in the variable US_EQUITY_PRICING_BCOLZ_COLUMNS within zipline/data/us_equity_pricing.py. How would I go about doing this?