Combine some Custom Fields into groups when configuring SearchWP engines

functions.php

<?php

// Combine some Custom Fields into groups when configuring SearchWP engines.
add_filter( 'searchwp_meta_groups', function( $meta_groups, $args ) {
  // Create a meta group in the SearchWP engine Custom Field dropdown
  // called 'My Meta Group' with meta_key_1 and meta_key_2 inside.
  $meta_groups['my_meta_group'] => array(
    'label'    => 'My Meta Group',
    'metakeys' => array(
      'my_meta_key_1',
      'my_meta_key_2',
    ),
  );
  
  return $meta_groups;
}, 20, 2 );