Hass.io addons config - audio parameter

Hi all!
Does anyone know how Hassio addons generate ALSA config?
Acording to the Docs https://developers.home-assistant.io/docs/en/hassio_addon_config.html there is a parameter in config.json called audio
Mark this add-on to use internal an audio system. The ALSA configuration for this add-on will be mount automatic.

On my host system I have custom /etc/asound.conf
So I’m trying to make hassio addons use it… When I start an addon, in its docker container I see default asounf.conf

So any help or ideas will be appreciated.
Now I have to change addon files manually and rebuild it =(

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Maybe anyone has some information?
Really stucked with this :confused: