I solved this. Basically on the Streambar add a tablet or smartphone, then toggle to the PC and add a bluetooth device, it will show under other but not audio, then go to settings on your PC and go to sound, then manage sound devices. You should see a disabled option called TV tuner audio with Roku soundbar stereo underneath. Just enable it and you'll have the the roku as an audio output option via bluetooth.
I can confirm this work the audio was very poor at first but I found an update for my pc that fixed the wonky audio. Not perfect but happy it works
My System is Windows 11 so I can't be sure that this applies to Windows 10 but likely it does or there is a similar setting.
On PC, in Settings --> Bluetooth & Devices --> Devices under Device settings toggle Bluetooth device discovery from Default to Advanced
After I did this I was ecstatic that my PC found the Roku Streambar.
I hope this resolves your issue as well.
