While looking for a solution to the same question, I stumbled upon this: dev update. Boone B. Gorges made a “sample plugin to show how these visibility levels can be extended”: BBG’s Sample Visibility Plugin. All you have to do is create a new folder in your wp-content/plugins, and upload bbg-custom-bp-field-visibility.php & loader.php into your new folder. Then, modify bbg-custom-bp-field-visibility.php to your liking.
While I was looking for the same answer I stumbled upon this: dev update. Boone B. Gorges made a “sample plugin to show how these visibility levels can be extended”: bbg-custom-bp-field-visibility Plugin just create a new folder in your wp-content/plugins, and upload bbg-custom-bp-field-visibility.php & loader.php into your new folder. Finally, modify bbg-custom-bp-field-visibility.php to your liking.