Custom log integration with json file - no data

[maar]

1. I successfully added the agent:
   
   

---

2. I added Custom Logs integration to the Default policy:
   

   

   Custom configurations:

   agent.logging.json: true
   json.keys_under_root: true
   json.add_error_key: true
   

3. Contents of the /tmp/file.json:

   {"name":"John","age":30,"company":"asdf"}
   

4. And there's no data:
   

   

5. The system integration is working as expected on the agent.

Any idea what's wrong?