Don't know much about IGBT but this seems to be Simscape language syntax. After the "subcircuit2ssc" function, an object for ssc_build is generated so I guess it's a set of .ssc files. In the "nodes" section of the .ssc files, you can specify the location of the nodes with the comment on each line. More info here: https://www.mathworks.com/help/physmod/simscape/lang/nodes.html
So, before you run the ssc_build, edit the .ssc files in the library folder to change the node location.