I’m assuming that what you posted is some type of twig code. I don’t think that there is any way to save ACF fields using that form and ACF will not be able to save value for twig using acf_form.
http://www.advancedcustomfields.com/resources/create-a-front-end-form/
http://www.advancedcustomfields.com/resources/acf-pre_save_post/
