Integrate CalDAV to Android Outlook

Is it possible to integrate the CalDAV calendar into the Android Outlook app? Usually, CalDAV calendars don’t appear in the Android Outlook app, so I search for a way to integrate CalDAV into Outlook. I know there is a software called [Outlook CalDav Synchronizer](https://caldavsynchronizer.org/) but it's only for desktop (Windows). There is another app called [DAVx5](https://www.davx5.com/) to synchronize CalDAV, but it's a paid app and I don't want to waste it. Does someone have the experience?