I created custom profiles for my Fujifilm GFX 50s.
The profiles are in the appropriate camera profiles folder under \library\appsupport\adobe\cameraraw\cameraprofiles\
How do I make them accessible in LR and CR interface for PS?
Did you use the user folder and not the sahred system folder as mentioned here: https://www.lightroomqueen.com/articles-page/lightroom-cc6-default-locations/
Macintosh HD / Users / [your username] / Library / Application Support / Adobe / CameraRaw / CameraProfiles /
You also need to close and restart LR for the new profiles to appear.