Document of Record EL expression to read DFF context segment

Summary:

Is there an EL expression to read the the content of a document record context segment?

Content (please ensure you mask any confidential information):

We would like to make a DoR DFF context segment read-only with page composer if it is filled, as described here: https://community.oracle.com/customerconnect/discussion/565554/need-to-hide-a-context-sensitive-segment-for-only-1-document-type. We are hence looking for an EL expression which will return the current value of the context segment. We have tested #{bindings.<api name of segment>.inputValue != null} but this does not return the current value of the segment.

Note: For the Assignment EFF the following works for reading a value from a context segment and determining if it is filled: #{row.bindings.<api name of segment>.inputValue != null}