The answer is NO.
Xojo does not support the creation of either Carplay apps, AppleWatch or AppleTV apps.
Heck in my opinion, it barely supports iPhone or iPad… but that is just my opinion
And I’ll even bet (but I don’t know for sure), that it won’t support the new feature of allowing an iPhone or iPad app to be run directly on an ARM Mac Desktop (and I’m not talking about Catalyst)