This is nonsense, you don’t just need an “adapter” to convert a 3.5mm to USB-C. What you talking about is a DAC or external soundcard. Just because they can make them small doesn’t make it an adapter and since the laptop clearly already has a DAC and amplifier since it has working speakers, it is silly to make me buy another, especially since the majority of external tiny DACs sounds like crap and are underpowered.
I’ve used a bunch of different solutions over the years, but currently I just run Gerbera and it streams my local library to my TVs because of the sheer ease. It’s not perfect, fast forward and rewind can be iffy to get working with some configurations, but otherwise it has been a smooth experience.