Prepend and/or Append custom string when outputting a field using WP Job Manager Field Editor

functions.php

<?php

// Make sure to change YOUR_META_KEY to match the meta key you want to prepend/append to
add_filter( 'field_editor_output_as_args_YOUR_META_KEY', 'smyles_add_custom_prepend_append' );

function smyles_add_custom_prepend_append( $args ){
	// Shown before value:
	$args['prepend'] = 'Before Value: ';
	// Shown after value:
	$args['append'] = 'After Value';
	return $args;
}