Add predefined dynamic variables from Jet Engine to SEOPress' schemas

post-meta-fields-jetengine-automatic-schemas-seopress.php

<?php
add_filter('seopress_schemas_mapping_select', 'sp_schemas_mapping_select');
function sp_schemas_mapping_select($select) {
	//Add the new group option + option to the list
	$select['Jet Engine'] = [
		'my_new_dynamic_variable_key' => __('My new dynamic variable title', 'wp-seopress-pro'),
	];

	return $select;
}
add_filter('seopress_schemas_dyn_variables', 'sp_schemas_dyn_variables');
function sp_schemas_dyn_variables($vars) {
	//add the variable key
	$vars[] = 'my_new_dynamic_variable_key';
	
	return $vars;
}
add_filter('seopress_schemas_dyn_variables_replace', 'sp_schemas_dyn_variables_replace');
function sp_schemas_dyn_variables_replace($values) {
	// Replace my_jetengine_custom_field with the name of your meta field (to be used with custom database storage)
	$values[] = esc_attr(wp_strip_all_tags( jet_engine()->listings->data->get_meta( 'my_jetengine_custom_field' ) ));

	return $values;
}