q-eud-admin-meta_keys_common.php

// common keys -- could be built using a seperate query ##
\add_filter( 'q/eud/admin/meta_keys_common', [ get_class(), 'meta_keys_common' ], 10, 1 )
    
/**
* Return list of commmon keys
*
* @since 2.0.0
*/
public static function meta_keys_common() 
{

    // common keys ##
    $array = [
        'example_usermeta_key',
        'first_name',
        'q_'
    ];

    // return ##
    return $array;

}