How to listen to [Android phone's music] from [a headphone that is connected to a Windows 10 desktop] without internet connection?
I have an Android phone (Pixel 3a) with YouTube Music installed on it.

When I don't have internet connection, I want to be able to wear my headphone, which is connected to my desktop (Windows 10) and listen to both my desktop's audio (for example, game sound) and the music playing on my phone (for example, music that is available only on the phone's YouTube Music offline downloaded folder).

How can I achieve this?