Hello danobmn,
Thank you for using Apple Support Communities. You can make audio FaceTime calls using your Apple Watch by following these steps here: Make phone calls on Apple Watch - Apple Support
Make a call
1. Open the Phone app
on your Apple Watch.
2. Tap Contacts, then turn the Digital Crown to scroll.
3. Tap the contact you want to call, then tap the phone button.
4. Tap FaceTime Audio to start a FaceTime audio call, or tap a phone number.
5. Turn the Digital Crown to adjust volume during the call.
As for Group FaceTime audio calls, this feature isn't supported on your Apple Watch. In order to use Group FaceTime features, you need to use a compatible iOS and iPadOS device: Use Group FaceTime on your iPhone or iPad - Apple Support
To use Group FaceTime video calls, you need iOS 12.1.4 or later, or iPadOS. on one of these devices: iPhone 6s or later, iPad Pro or later, iPad Air 2 or later, iPad mini 4 or later, iPad (5th generation) or later, or iPod touch (7th generation). Earlier models of iPhone, iPad, and iPod touch that support iOS 12.1.4 can join Group FaceTime calls as audio participants.
We also recommend that you review Apple's Unsolicited Idea Submission Policy. Specifically, the section under "Product Feedback". That way you can leave Apple feedback on things they change or improve: Legal - Unsolicited Idea Submission Policy - Apple
Thank you for using Apple Support Communities. Take care.