There are lots of ways using the expression language to dynamically respond to changing columns from the node above the expression node but I don't think you'll be able to turn a variable value into a column name on the fly. If you haven't seen reviewed the Expression Language Guide yet, you may find suggestions there.
Ron
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Need to connect to databases in SAS Viya? SAS’ David Ghan shows you two methods – via SAS/ACCESS LIBNAME and SAS Data Connector SASLIBS – in this video.