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I tried adding this to the operators:
```        - type: json_parser
          if: 'body startsWith "{"'
          parse_from: body
          parse_to: attributes.body```
But no `attributes.body` field appears anywhere

Yeah you will have to use json parser, based on your log line you migh have to use a regex parse if there are non json elements in your log line
ex:- <https://github.com/SigNoz/logs-benchmark/blob/0b2451e6108d8fa5fdd5808c4e174bd52b9d55d3/signoz/signoz-client/otel-collector-config.yaml#L9>