Register custom meta box for JetEngine from code

jet-engine-metabox-from-code.php

<?php

add_action( 'jet-engine/meta-boxes/register-instances', 'my_register_meta_box' );

function my_register_meta_box( $meta_boxes_manager ) {
	
	// Replace my_post_type_slug with your actual post type slug
	$post_type   = 'my_post_type_slug';
	$object_name = $post_type . '_group';

	$meta_boxes_manager->register_custom_group(
		$object_name,
		__( 'My Post Type Settings', 'jet-appointments-booking' )
	);

	$meta_boxes_manager->register_metabox(
		$post_type,
		array(
			array(
				'type'  => 'text',
				'name'  => '_app_price',
				'title' => __( 'Price per slot', 'jet-appointments-booking' ),
			),
		),
		__( 'My Post Type Settings', 'jet-appointments-booking' ),
		$object_name
	);
}