Wohome soundbar

Trying to figure how to use my DirectTV Genie RC72 remote to control the Wohome soundbar S29. Old Bravia TV allows optical or RC feeds to external audio device feed, but neither then let the Genie remote control the volume. (no HDMI Arc on this older TV).  Having to use the Wohome remote. Wohome is a popular brand and sold by Walmart and on Amazon, but not currently listed as an option on the DirectTV Audio Device Brand Selection under the Settings for the Remote Control.