RP5 as wireless acces with pihole & unbound

At the base of my TV I have a wifi deadspot, just where my Bose soundbar goes.
As nearby I have my cabled RPI5 server with Pihole and unbound I want to use it as an wireless access point on the same network just for the soundbar.

All info I can find is to set it up as a subnet with own SSID (e.g using Wifi Hotspot.
In order to mesh with other networked Bose equipment its needs to be on the same network.
The Bose app doesn’t even always work with a wifi extender and the same SSID

Can the RPI be setup as a simple passthrough?
The other option is invest in a Mesh but that’s expensive, and not even sure if it would work
Anybody got any ideas?.

Your use case can’t be covered with out default hotspot setup. Therefore you can use RaspAP in Bridged AP mode for this. Bridged AP mode - RaspAP Documentation

Or any other documentation from the web, describing on how to setup a WiFi access point

Thanks, I’ll have a go at the weekend