Playing background music from external device when I am on Zoom session on my Windows 10 laptop

When I sing on Zoom using default microphone and speaker of my Windows 10 laptop, my karaoke music from my mobile does not reach the participants. Even when I use a Bluetooth microphone and connect my mobile with this microphone my voice is heard clearly but the music is not heard by the participants. What should I do? I am not the host, so I can't share my screen / computer audio.