this is no issue, just a question i want answered.

It seems that the "Projectors" - is the feature you need for a video sources. More about OBS projection of different sources to different display devices and to standalone windows: https://obsproject.com/kb/power-of-projectors . If you have only one display device and the game running fullscreen - then no go. Sometimes it is possible to send some info (audio/video feed as well) to the smartphone or to other device via network (look for "OBS websocket", "NDI", "teleport", "VLC multicast" etc).
If you need to hear audio source on the same PC then look for the "Audio Monitoring" feature of OBS.
 
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