A:Answereasiest way would be a Bluetooth Transmitter hooked up to the TV's headphone jack and then you can connect your BT Audio Devices to the BT Audio Transmitter. Amazon/ebay has them for like $20 and up..
A:AnswerIt has WebOS. As far as syncing the voices, I haven't had that problem with my TV except with certain streaming services, but I don't think it's an issue with the TV.
A:AnswerThe LG 55 Inch Class 4K HDR Smart LED TV (54.6'' Diag), Model # 55UM6910PUC is Google Home and Amazon Alexa compatible but neither the Google Assistant nor Alexa voice assistants are built-in on this model. You would need to upgrade to the UN7300PUF or higher series LG TVs for TV models that have both Google Assistant & Alexa built-in...^IFV