It is possible to have bro log output (the same log for example http.log) in different file names and format one ascii and another json ? For example http_ascii.log and http_json.log
There is a package that provides more or less exactly this functionality: https://github.com/J-Gras/add-json
If you have installed the Bro Package Manager:
bro-pkg install add-json
It is exactly what I need.