Alright, nevermind, I found a solution, thanks to this topic :
=> In ACF menu, there is an export feature I had never noticed. (my bad).
I used it to get PHP code for my fields group (options page), pasted it into functions.php and VOILA : it works as expected.
Only tiny bug I noticed is it doesn’t handle accentuated characters
Sorry for the noob question.
… and glad to see once again how great ACF is !
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