You can now use your (compatible) Fujifilm camera as a webcam on macOS
(Digital Photography Review)

Fujifilm has released its Fujifilm X Webcam utility for macOS, making it possible to use compatible Fujifilm cameras as webcams on Apple computers. As with the Windows version, the macOS version of Fujifilm X Webcam makes it so you can use the following cameras as webcams in compatible video conferencing and live broadcasting apps when plugged into your Apple computer via USB: GFX 100 GFX 50S GFX 50R X-H1 X-Pro2 X-Pro3 X-T2 X-T3 X-T4 Fuji X Webcam version 1.0.0 is compatible with macOS 10.12 (Sierra) or later and is free to download on Fujifilm`s website. Fujifilm has published a user guide to help you get up and running.