Hue Essentials 1.4.0 in TestFlight now has support for your Apple Watch. This is a beta release which includes watchOS and can be installed from this link. Just install it on your iPhone and it will sync to your Apple Watch.
The current build supports watchOS 6.2 and so please make sure you update your watches. Apple watches starting with series 1 and higher should be compatible.
The watchOS version of Hue Essentials can toggle your lights, activate scenes, go into your groups and switch them. Furthermore, you can toggle your schedules and motion sensors. We are working on more items.
Let us know in your comments and feedback on TestFlight what you would like to see and what needs improvement.