BP - show xprofile data on Pending Users screen

xprofile-pending-users.php

<?php

// add the custom column header
function philopress_modify_user_columns($column_headers) {

  $column_headers['extended'] = 'Meta Fields';
  
  return $column_headers;
}
add_action('manage_users_page_bp-signups_columns','philopress_modify_user_columns');

// dump all the pending user's meta data in the custom column
function philopress_signup_custom_column( $str, $column_name, $signup_object ) {

     if ( $column_name == 'extended' ) 
          return print_r( $signup_object->meta, true );

    //If you only want to show specific meta fields, you need to know the field id(s). Then you could do this:
    //return $signup_object->meta['field_4472'];
    
  return $str;
}
add_filter( 'bp_members_signup_custom_column', 'philopress_signup_custom_column', 1, 3 );

Hi - how would I make this sortable?