I think GA support + FOSS will be hard to find. That's often a feature for paid apps, but too niche for foss
One option might be to use Mycroft, the FOSS speech assistant. If I understand correctly you'd have to install support for playing local music - I found one such plugin, but it hasn't been updated in a few years so who knows if it'll work.
It's not FOSS, but Symfonium should be able to do that.
Once I rented a car with voice commands (not android, and Bluetooth. It was able to reproduce my music from my phone (using Vinyl from F-droid). I think it connects directly to some sort of API on the phone once it's paired, so the music playback is controllable... YMMV.
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