How to Add Break line / Return on button click

I need to return the text concate with difference field from lead with line break

i try "\r" ,"\n" "<br>"

return "ali \r\n <br> baba";

None of above work.

i expected result something like this

ali

baba

but got this

ali \r\n <br> baba

so, how can i get a linebreak in string