Your receiver has record outputs for the VCR inputs. Those are fixed level and are not affected by the main volume control so you don't have to have the surround sound system volume up.
You would connect a bluetooth transmitter to either of those outputs. If you want to connect two speakers then you need one that will pair with 2 speakers. If you want more than two then you will need to use JBL speakers that support Connect+ which allows an unlimited number of speakers to be paired with one source.