For the record, "PS Remote Play" inheritantly SUCKED. Probably to entice users to buy a portal.
Off the record, 3rd party app "PXPlay" is a very reliable, albeit hard to set up using mobile data, alternative that WAS NOT LAGGY, AND it supports 60 fps and 1080p, while remote play lags along and pixelates at 30fps and 720p. Just so you know.
PS, the portal has no Bluetooth module built in as far as I know, but you COULD get a Bluetooth receiver that connects to the 3.5mm aux jack, though, I have no idea how much sound quality would degrade.