Thanks. Anyway, I think I found an easy solution to my need. I hope this helps someone else:
1- Go to a page containing an unicode list of emojis, like https://emojipedia.org or Unicode Emoji 😄
2- Copy your emoji and paste it in the title 💷 🐕 💅 💷.
It will still appear in the title but not in the url. You can use many emojis 💷 🐕 💅 💷 
, and not only the basic ones, like :) :(
Note: in the editor and in the preview, they are showing if firefox, but not in chrome browser at least in my computer