How to get "System Name" for columns in a cursor when using SQL-CLI

I am in a situation where the DDS database is now converted into a SQL
database so each table is now created like this:

CREATE OR REPLACE TABLE mytable (
id FOR COLUMN TFROWID BIGINT NOT NULL GENERATED ALWAYS AS IDENTITY
PRIMARY KEY,
Active_Job_Name FOR MYACTJOB char(26)
) RCDFMT mytableR;

However all the access to the new tables need to know the original column
name so the code will not have to be rewritten.

The question is - how do I get the "FOR" system name ( here MYACTJOB) ?

The "SQLDescribeCol" gives the new SQL name, so instead I was trying to use
the "SQLColAttribute" function but I don't find the option among the
features listed:

SQL_DESC_AUTO_INCREMENT INTEGER
SQL_DESC_BASE_COLUMN
SQL_DESC_BASE_SCHEMA
SQL_DESC_BASE_TABLE
SQL_DESC_COLUMN_CCSID
SQL_DESC_COUNT
SQL_DESC_DISPLAY_SIZE
SQL_DESC_LABEL
SQL_DESC_LENGTH
SQL_DESC_NAME
SQL_DESC_NULLABLE
SQL_DESC_PRECISION
SQL_DESC_SCALE

Perhaps I am using the wrong function?

Any help will be appreciated. Thank you.