Bluetooth speaker on Roku Device

I love the Roku OS, but, I dont love that my new Roku 65" pro does not allow me to connect a Bluetooth amp.  

The Amp connects several speakers I already have built in.   

If I add a random roku speaker , would the speaker allow me to connect my Bluetooth Amp?   

I was able to add the device as headphones, but it wasnt automatic and I had no volume control on the roku remote and there was a delay in sync of picture and sound. 

I am open to ideas as to how to hook up my Pro to my amp.   Thanks to all.