Since the launch of Apple Watch Series 8, the new SE and watchOS 9, anyone, including older models that support the latest watchOS 9, can use Nike watch faces.
The most convenient way to add a new watch face is from your iPhone (iOS 16) with the Watch app. There, just go to the Shield Gallery / Face Gallery tab and search for the section with Nike shields. It only remains to choose the one that interests us and modify it to meet our expectations.
From Apple Watch
If you prefer to do it from the Apple Watch, you should first hold your finger on the watch face and when the smartwatch enters the edit mode, scroll our dials to the left until we get to the New / New option (left screenshot). Then press the plus and scroll through the shield categories until we see the Nike section (middle screenshot). Now just click on it and select the appropriate one from the list of all Nike discs (right screenshot).
The next step is to configure the shield. In the left screenshot you can see that the color is now being edited. With the left / right gesture, we change the element of the shield that we want to edit, from the color, for example, to complications or font selection, etc. After editing, hold the finger on the dial and wait until we exit the edit mode (middle screenshot). Then all that's left is to enjoy the new shield (screenshot right).