Disable render template engine in Html Field

When you have an HTML field, someone can frappe.render_template to render a custom html file. The thing is that frappe uses a not so “trendy” render engine with some crazy {% %} Jinja hacking. I need to disable it.
In the past and in other projects like Django i use something like {% verbatim %} or in the Flask (Jinja) world {% autoescape false %}.

It where something equal in frappe render template engine ? and if not where is the file that initialize the engine options.

autoescape extension is not available on Frappè right now. But you can try to hack into jinja.py file and add it.