Accessing the attributes of a class using field symbols?

An option to pulll a variable into a user exit that otherwise would be out of reach is detailed [here|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/208811b0-00b2-2910-c5ac-dd2c7c50c8e8]

Can a similar approach involving field symbols or otherwise, be used to pull in the attributes of a class into the exit? For now, I'm trying to access the A_FRONTEND_INDEX attribute of the class CL_HRXSS_REM.

any ideas?

~Suresh