Bluetooth is working on Librem 14v1 and sys-audio. See Audio qube - #98 by PeakUnshift.
You need to install atheros-firmware. The bluetooth component is connected to the motherboard via USB, so you need to connect it via sys-usb to sys-audio (it doesn’t have an explicit name, for me it’s sys-usb:2-3 - 0489_e076).