Accessing all fields in custom display

I’d like to add custom outputs in my Custom Display, and am trying to write my own shortcodes (WP shortcodes not the ones dynamically created for the output). To do this I’d like to access the current array of values to pull what I need. Is this information available through a global variable I can access from my shortcode handler?

No, it's not. But you can pass the entry ID to your shortcode, then get the entry from there.
[yourshortcode id=[id]]

Then, the most efficient way to get the entry would be:
FrmEntry::getOne($id);

Topic closed.