Disable parent categories from being selected in taxonomy chosen dropdown for WP Job Manager Field Editor

functions.php

<?php
// ^ there should ONLY be one of these at the top of child theme's functions.php file or use the Code Snippets plugin

// THIS IS JUST ANOTHER EXAMPLE USING THE CODE BELOW TO ONLY LOAD ON THE SUBMIT/EDIT LISTING PAGE IF YOU DONT KNOW
// HOW TO ADD YOUR OWN CUSTOM JAVASCRIPT

add_action( 'submit_job_form_start', 'my_custom_jquery_disable_parent_categories' );
function my_custom_jquery_disable_parent_categories(){
  echo "<script>
		jQuery( function($){

			// To use for field other than job_region, change job_region to the meta
			// key of the field, right below here
			$( '#job_region > .level-0' ).each( function ( index ) {
				$( this ).prop( 'disabled', 'disabled' );
			});
			
			// and right below here
			$( '#job_region' ).trigger( 'chosen:updated' );

		});
  </script>";
}

script.js

jQuery( function($){
	
	// To use for field other than job_region, change job_region to the meta
	// key of the field
	$( '#job_region > .level-0' ).each( function ( index ) {
		$( this ).prop( 'disabled', 'disabled' );
	});

	$( '#job_region' ).trigger( 'chosen:updated' );

});

Combine this together with this code that sets parent taxonomies automatically:
https://gist.github.com/tripflex/65dbffc4342cf7077e49d641462b46ad