you need snapcast, the server on your laptop will out put over the network and the app on your phone will play it. also it would allow you to add more speakers over time
There's this: https://github.com/mkckr0/audio-share
Or this: https://audiorelay.net/downloads
Probably 50 more apps for it as well. I've not tried it, but any of them should work, I imagine
You COULD use a casting client and server, but it's probably much easier to just use the tablet as a Bluetooth target. Some phones/tablets just do this, but there's also simple free apps out there that enable this as well.
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