MyVolumio is a set of premium features which are not open source. This includes TIDAL, QOBUZ, Auto-sync of settings and remote control (soon CD Playback and Ripping).
So they are not available on custom images.
TIDAL and QOBUZ integrations (and other features) are available via our OEM program, where we fine-tune and customize Volumio for several audio brands, as you can see here: volumio.org/oem-custom-solutions/