Windows 10 has included the Bluetooth A2DP Sink feature that allows you to stream your music and audio from your smart phone to your PC's speakers via Bluetooth. It has been added in the May 2020 update. If you don't hae this update currently, you will have to install it manually.
Here's how to use this feature:
- Install the May 2020 Windows 10 update. If it's already installed then you can proceed with the next step. If it isn't then you can manually download it from HERE.
- Go to Settings > Devices > Bluetooth & other devices and enable Bluetooth on your PC.
- Add a Bluetooth device. Make sure Bluetooth is enabled on your phone as well. Select your phone and pair it with your PC.
- Now download the Bluetooth Audio Receiver app (free) from Microsoft Store. Here's the link
- Install the app and select your phone inside the app and click on "Open Connection".
More details with Screenshots Here.