Example checkbox grouped field for PMPro Regiser Helper.

my-pmprorh-init-checkbox-grouped-example.php

<?php
/**
 * This recipe creates custom fields for membership registration.
 *
 * @requires Register Helper Add On
 * @link https://www.paidmembershipspro.com/add-ons/pmpro-register-helper-add-checkout-and-profile-fields/
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmprorh_init_custom_registration_fields_1625464156() {
	// don't break if Register Helper is not loaded
	if ( ! function_exists( 'pmprorh_add_registration_field' ) ) {
		return false;
	}

	// define the fields
	$fields = array();

	// GROUPED CHECKBOX
	$fields[] = new PMProRH_Field(
		'checkbox_grouped_example', // input field name, used as meta key
		'checkbox_grouped',         // field type
		array(
			'label'          => 'Checkbox Grouped',
			'hint'            => 'This is a hint', // display a hint under field
			'options'        => array( // <option> elements for select field
				'option_1' => 'Option 1', // <option value=”option_1”>Option 1</option>
				'option_2' => 'Option 2', // <option value=”option_2”>Option 2</option>
				'option_3' => 'Option 3', // <option value=”option_3”>Option 3</option>
				'option_4' => 'Option 4', // <option value=”option_4”>Option 4</option>
			),
			'profile'         => true, // show on profile
			'memberslistcsv'  => true, // include when using export members to csv
			'addmember'       => true, // include when using add member from admin
			// 'required'        => true, // make field required
		)
	);

	foreach ( $fields as $field ) {
		pmprorh_add_registration_field(
			'checkout_boxes', // location on checkout page
			$field     // PMProRH_Field object
		);
	}
	unset( $field );

	// that's it. see the PMPro Register Helper readme for more information and examples.
}
add_action( 'init', 'my_pmprorh_init_custom_registration_fields_1625464156' );

@ipokkel @strangerstudios, I'm having trouble showing the asterisk next to the label for the checkbox_grouped. I was able to show it for all other fields, but not this one. Is there any special settings I need to change?
I already have:

'required'	=> true,
'showrequired' => true,

Still, the asterisk is not showing.
Any help is greatly appreciated!

@p-prado You should consider moving the asterisk to inside the field label - https://gist.github.com/ipokkel/9cb626b95e37d1a45faba69ac8fe21fa