Thank you Krileon or your answer, but probably i was not clear enough on my question.
I am sending an image so that you can understand better what we need. I have read the substitutions tutorial several times and i am using substitutions for years.
Please check the image so that we are sure we are talking about the same thing.
According to your suggestion i created a custom html field (image1), but what i get on registration page is (image2).
What we need to have is... (image3)
image1
image2
image3