Thnak for your answer,
I have seen all stack overflow post, especially this one but it seems that doesn't really work as expected.
I know i can create content by admin panel, but i can only choose my layout for all CMS page content. (not a unique one)
Any idea on a method to call a template file directly ?
I really would like to mange my file, to include some hooks, extra lib... but i don't know how to call it throught a route with prestashop...