You would have to calculate this in a SAS Code node. If you connect your Regression node to a SAS Code node, then in the SAS Code node, the data set represented by the &em_import_data macro variable contains your actual and predicted target for each obervation. So you could do something like:
data calc_mape;
set &em_import_data;
mape = %EM_RESIDUAL / %EM_Target;
run;
proc means data=calc_mape sum;
var mape;
run;
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