Adding Schema to web pages.

functions.php

/* Add Schema to HTML head on DIVI Theme only!!! */
add_action('et_head_meta', 'custom_schema_json');
function custom_schema_json () {
	$schema = get_post_meta(get_the_ID(), 'schema_field', true);
	if(!empty($schema)) {
	 echo $schema;
	}
}