Adding a command line flag to homeassistant in hass.io

I’ve installed HA in Docker through HassIO. Now I want to add a command line flag to customize log file location. In HA, this is done through --log-file flag, as described in https://github.com/home-assistant/home-assistant/pull/9422. How can I do it in HassIO?

Did you find the solution to this? I want to do the same and cannot fnd an example.