I add StrInsert plugin to my CKEditor. It basically adds a button, which in my editor, is labeled CRM Field. 
What the button does is it will append a value to my editor. For example: when I click $[FIRST_NAME] from the dropdown, it will append the text ${__VCG__VAL__FIRST_NAME}to my editor.
Why did I name the dropdown $[FIRST_NAME] instead of ${__VCG__VAL__FIRST_NAME}? Because I want the HTML to be <p>${__VCG__VAL__FIRST_NAME}</p> while the text shown in the editor is $[FIRST_NAME]
As seen in screenshot_2, the HTMLshown underneath is exactly what I want, but instead of showing the text ${__VCG__VAL__FIRST_NAME} I want the editor to show the text $[FIRST_NAME]
My question is, how can I make the HTML differ from the text shown in the editor for some reserved keywords?