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Attach bid-ask prices CSV

Hi everyone,
I want to attach my own data for 10 bonds. My 10 csvs have these columns Time, Bid, Ask.
I also have 1 csv with signals: Date, Bond to buy. I am importing this with fetch_csv.

Does Quantopian or Zipline read bid-ask data? How can I import it to do so? Do this have to be inside context.bond1, bond2...

I can't find any example. Many thanks