Hook um_{$type}_form_show_field

um_type_form_show_field.php

<?php

/**
 * Hook: um_{$type}_form_show_field
 *
 * Type: filter
 *
 * Description: Change field HTML by field $type.
 *
 * @example https://github.com/ultimatemember/ultimatemember/blob/master/includes/core/class-fields.php#L4490
 * @link    https://docs.ultimatemember.com/article/1323-umtypeformshowfield
 *
 * @package um\core
 * @see     um\core\Fields::view_field()
 * @since   2.0
 * @version 3.0
 *
 * @param string $output Field HTML.
 * @param string $mode   Form mode.
 *
 * @return string Field HTML.
 */
function my_type_form_show_field( $output, $mode ) {
	if ( 'login' === $mode ) {
		// your code here.
	}
	return $output;
}
$type = 'text';
add_filter( "um_{$type}_form_show_field", 'my_type_form_show_field', 10, 2 );