This may be the wrong 'board' but there was no correct one to choose from!
In past versions of Android there would be the vertical three dots at the upper right hand corner of a contact whereby it was possible to add customization sounds for the contact. That is missing from this phone which is running Android 11. It is possible to marginally change a vibration pattern but there seems to be all. So... who options do I have to create there custom settings without linking them to Google Services.