There isn't a way to call a step from script.
Instead of populating an array in JScript, use vbld_AddDelimValue() to populate a tab delimited macro.
Then iterate over the macro values with vbld_NextDelimValue() calling the Run Sql action for each value (see the Misc.bld sample for details).
Also see this thread:
http://www.kinook.com/Forum/showthread.php?threadid=231
Kevin