Oh, it is working in Elixir 1.4. 
See https://github.com/elixir-lang/elixir/issues/5754#issuecomment-278785958

On Thursday, July 13, 2017 at 10:57:15 AM UTC+2, Stephan Epping wrote:
>
> Thanks. I was looking at Elixir 1.4 though :(
>
> On Thursday, July 13, 2017 at 10:43:40 AM UTC+2, José Valim wrote:
>>
>> Please see the "Custom formatting" section in the Logger docs: 
>> https://hexdocs.pm/logger/master/Logger.html
>>
>>
>>
>> *José Valim*
>> www.plataformatec.com.br
>> Skype: jv.ptec
>> Founder and Director of R&D
>>
>> On Thu, Jul 13, 2017 at 10:27 AM, Stephan Epping <[email protected]> 
>> wrote:
>>
>>> *Use case*
>>>
>>> I need to convert the log format that is used for `:console` to print in 
>>> json format. (Because we use a docker syslog backend that forwards `stdout` 
>>> to logstash). 
>>>
>>> *Preferred Solution*
>>>
>>> Ideally, I would give the `:console` backend a custom formatter via 
>>> config. The custom formatter than just converts the metadata and message to 
>>> a json string, which is printed by the default `console` backend. But right 
>>> now the backend relies on `Logger.Formatter` exclusively. 
>>>
>>> *Alternative*
>>>
>>> Add a custom backend that in fact intercepts the log message and 
>>> converts it to json and then forwards it to the `:console` backend. 
>>> Drawback: one need to somehow start and wrap the `console` backend. 
>>>
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>>

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