Use post meta fields from a JetEngine custom table and SEOPress

post-meta-fields-jetengine-seopress.php

<?php
function sp_titles_template_variables_array($array) {
    $array[] = '%%my-custom-global-variable%%';
    return $array;
}
add_filter('seopress_titles_template_variables_array', 'sp_titles_template_variables_array');
function sp_titles_template_replace_array($array) {
    // Replace my_jetengine_custom_field with the name of your meta field (to be used with custom database storage)
    $array[] = esc_attr(wp_strip_all_tags( jet_engine()->listings->data->get_meta( 'my_jetengine_custom_field' ) ));
    return $array;
}
add_filter('seopress_titles_template_replace_array', 'sp_titles_template_replace_array');
function sp_get_dynamic_variables($array){
    $array['%%my-custom-global-variable%%'] = 'My new dynamic variable title';
    return $array;
}
add_filter('seopress_get_dynamic_variables', 'sp_get_dynamic_variables');