Logging an additional field in JSON logs in Python logging

Question

I am trying to log an extra object in the logs of my app.

For the logger, I have an additional formatting structure, for example something similar:

{"version":"1.0","application":"app" ... etc}

then I am adding this formatter to my StreamHandler and as an output I always get those fields.

I tried with the "extra" keyword with doing something like:

log.info('this is an example log with a field', extra={'field':'value'})

but nothing happens I tried also adding the 'field' to the formatter string, but actually i don't know how to tell the logger to log the field if it appears in the logs.

i really want to loga body_dict object inside of this extra field and to query it later via Elastic.

Could anyone help?