BMW ID8
This theme was introduced in updates Ksw-Q-Userdebug_OS_v3.8.6-ota, Ksw-R-M600_OS_v2.3.1-ota and Ksw-R-M600_OS_v2.3.1-ota, therefore it might not be available to activate on earlier firmwares.
To make this theme available for selection in your factory settings, you might need to modify your factory_config.xml file. Find the <SupportUIList /> section and add the following line: <Item id="1" name="BMW_ID8_UI" display="BMW ID8" />. More information and examples can be found in factory settings section.