ProForms custom action not working acoording to Bricks docs

Currently, ProForms custom action’s doc’s are referring to the bricks custom action. But neither $form->get_settings()["fields"] nor $form->get_field_value( 'myid' ); are working…

So, how is it supposed to work, how should I retrieve name → id of all fields and their appropriate value the best?

I think at least a quick, minimal example in the docs would be helpful.