Enfold add_image_size

Hello,

I’ve read many posts on how to add image size to enfold in a child theme and i don’t succeed…
My goal is to use it in the Image Shortcode.

This is what I add to my functions.php in the child theme :

function avia_change_image_size_array() {
	global $avia_config;
	$avia_config['imgSize']['my_size'] = array('width'=>700, 'height'=>700 , 'crop' => false);	

       $avia_config['selectableImgSize'] = array(
		'square' 				=> __('Square','avia_framework'),
		'featured'  			=> __('Featured Thin','avia_framework'),
		'featured_large'  		=> __('Featured Large','avia_framework'),
		'portfolio' 			=> __('Portfolio','avia_framework'),
		'gallery' 				=> __('Gallery','avia_framework'),
		'entry_with_sidebar' 	=> __('Entry with Sidebar','avia_framework'),
		'entry_without_sidebar'	=> __('Entry without Sidebar','avia_framework'),
		'extra_large' 			=> __('Fullscreen Sections/Sliders','avia_framework'),
		'my_size'				=> __('Ma taille perso','avia_framework'),
		
	);

}
add_action( 'init', 'avia_change_image_size_array', 0);

But it seems that this hook is trigger after avia_backend_add_thumbnail_size(), even with a priority of 0.

Thanks for your help.