Google Gemini is gradually being rolled out to Volvo vehicles as an opt-in upgrade to Google Assistant. When it's available for your Google account, you will be able to opt in to get started.
Connect Plus lets you use your vehicle's built-in internet connection to run Google services and related apps that are integrated into your vehicle.
Google has a support site for the Google apps and services that are built into your vehicle. You can also find a complete list of Google apps available to your region.