How to add chat script to prestashop?

hello good morning, I currently have my prestashop and I need to put a chat only on some products of the store, this chat is just a script, the company that provides it tells me that I should put it in the footer, I would like to know if your product let me do this

Hello,

i confirm that with "html box pro" module you can achieve what you expect.

Module allows to:

• insert script chat (and any other scripts or javascript,css,html code etc. module has "source code" tool:
  
  
• insert contents in footer:
  
• display these contents on selected product pages only:
  

best regards,

milos