CTL-J is just the line feed character. There is a constant for this in the string palette. If yu want to include it in a string control or constant, right click on the control constant and change to '\' Codes Display and send \n or select Hex Display and send hex 0A.
I guess I need a new pair of glasses. CTL + ] is hex 1D. To send it as a '\' code, you send '\1D'. If you are going to be doing much of this, you should search google for an ASCII code table. All of this would be in one.