Importing DAViCal calendar into macOS Calendar app

I installed DAViCal (v.1.1.4) on my Ubuntu (16.04 LTS) server under a subdirectory mydomain.com/davical/ and want to import it into my Calendar App (v11.0 (2855.1.2)) on my macOS 12.1, but I am failing: The instructions from [Client Config Page](https://davical.org/clients.php) don't work and from [iCal Config Page](https://davical.org/clients.php?client=iCal) is highly outdated... I managed to import the calendar into Thunderbird (Lightning) and even an Android phone (with Calendar Sync), so I confirmed, that the server works. How do I add a caldav account? What are the configs to use?