[Bro] Question : How can I change a particular log file format?

[Aneela Safdar]

Hi,
I am a newbie at bro and wanted to change log format of http.log file to json. Currently I have made changes in ascii.bro and now I am getting all logs format in json but what I have to do if I only want http.log to have that format and others keep default?
Also my log files have got still .log extension, how can I change it o .json?
Thanks,  Regards, Aneela Safdar
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