Hi @JoaoLuiz, I hope that you are well!
Using Google Translate 
, I understand that you’d like to know if it’s possible to edit the Knowledge Base template by adding a custom script to the HTML. Please let me know if that’s not the case.
I checked for you and I could see an Idea here: “More flexible knowledge base design and layout, including custom HTML/CSS” which is in planning!
On this Idea, you’ll find the comment of @tilly. So, I’d recommend submitting the form so that you can have access to the “Flexible knowledge base customization”.
I hope this helps!
Have a lovely day @JoaoLuiz and thanks so much for your help @Phil_Vallender! 
Bérangère