The following should replace the \n characters with line breaks,
replaceAll($vText, '\\n', ' ')
You can use it in a Change Variable action like this...
Hope this helps.
I believe you need to match \\n rather than \n as \n will match the actual line break character. Also I’m not sure how you’re using the output string, but if it is being used as html you might want to replace with ‘<br/>’ rather than br. If you’re trying to use it as plain text then perhaps replacing with ‘
‘ would is what you’re looking for.