Can I still listen to music when it's plugged into Macbook (monitor has no built-in speakers)

I've connected my Macbook Air to a Samsung monitor via an HDMI cable. The monitor doesn't have built-in speakers. I have a Marshall Bluetooth speaker that I usually connect sound output to from my Macbook. Is there a way to select and specify that Sound Output should be from Macbook to Bluetooth speaker, when the monitor is connected via HDMI?

I basically want to save my eyes, and use a big screen, but still listen to music and be able to watch videos with sound on this big screen. I bought the monitor off FB marketplace, practically new, for a great deal...so I didn't know it didn't have internal speakers.