The long wished-for feature is coming in the near future.
Google announces Wear OS 4, says Gmail and Calendar apps are on the way
The Google Pixel Watch may finally get dedicated Gmail and Calendar apps
Google Gmail, Calendar Apps for Wear OS Might Arrive Soon
Google Calendar app for Wear OS now rolling out with Tasks, Tiles and Complications - PhoneArena
Google Calendar App arrives for Wear OS bundling some new features - Gizmochina
Google announces Wear OS 4, Gmail and Calendar for watches
Google Confirms Wear OS 4 Along With New Gmail, Calendar and Backup Features - CNET
Wear OS by Google on the App Store
How to Get a Google Calendar App for Desktop (Mac or PC)