Since it is just in beta, no, will not be added at this time (from the upstream mailing list I know the developer has asked to include Kalendar to the monthly KDE Release Services, but not ready for that yet).
At this time, it is something to add to KCP or just build yourself.
https://kaosx.us/docs/package/
https://kaosx.us/docs/kcp/

2 months later