UITableViewCell Full Keyboard Access

I'm having a hard time finding documentation on how developers can customize Full Keyboard Access. I have a UITableViewCell that has a favorites button as a subview, and I can't get Full Keyboard Access to let me navigate to that button. I can't have the cell selection trigger the button because there's already existing behavior on cell selection (it presents a detail view).

I found this post from 3 years ago that never got an answer, but it seems pretty similar: https://developer.apple.com/forums/thread/64230
FKA users can access your control by doing ctrl+tab, which moves into focused elements. You can also add the button's action as a custom action on the table cell, which will expose the button in the actions menu (tab+z).
UITableViewCell Full Keyboard Access
 
 
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