Companion app in Unity

Hello,

I would like to develop a companion app for android using Unity, that would go with an oculus quest 2 application.

I did not find clear documentation about how to create it and how to connect the game with a dedicated companion app, do you have any information about that? Or should it be done by myself using Bluetooth communication?

I would like to do it, similarly to fitness app which are providing their own companion app (e.g. Supernatural - Companion App).

Thanks!