How do I create a label field that shows a warning or not?

<?php
/*
 * Your installation or use of this SugarCRM file is subject to the applicable
 * terms available at
 * http://support.sugarcrm.com/Resources/Master_Subscription_Agreements/.
 * If you do not agree to all of the applicable terms or do not have the
 * authority to bind the entity as an authorized representative, then do not
 * install or use this SugarCRM file.
 *
 * Copyright (C) SugarCRM Inc. All rights reserved.
 */

/**
 * Class SetColorAction
 *
 * SugarLogic Action to set a color to a field
 */

require_once("include/Expressions/Actions/AbstractAction.php");

class SetColorAction extends AbstractAction
{
	/**
	 * Store the expression
	 *
	 * @var mixed|string
	 */
	protected $expression = '';

	/**
	 * The field we are targeting
	 *
	 * @var string
	 */
	protected $targetField = '';

	/**
	 * All colors which may be returned by given expression
	 *
	 * @var string
	 */
	protected $colors = '';


	/**
	 * Constructor
	 *
	 * @param array $params
	 */
	public function __construct($params)
	{
		$this->targetField = $params['target'];
		$this->expression = str_replace("\n", '', $params['value']);
		$this->colors = str_replace("\n", '', $params['colors']);
	}

	/**
	 * Returns the javascript class equivalent to this php class
	 *
	 * @return string javascript.
	 */
	public static function getJavascriptClass()
	{
		return <<<JS
		SUGAR.forms.SetColorAction = function(target, valExpr, colorsExpr) {
			if(_.isObject(target)) {
				this.expr = target.value;
				this.target = target.target;
				this.colors = target.colors;
			} else {
				this.expr = valExpr;
				this.target = target;
				this.colors = colorsExpr;
			}
		};
		SUGAR.util.extend(SUGAR.forms.SetColorAction, SUGAR.forms.AbstractAction, {
			exec : function(context) {
				if(typeof(context) == 'undefined') context = this.context;

				context.target = this.target;

				var value = this.evalExpression(this.expr, context), colors = this.evalExpression(this.colors, context);

				_.each(colors, function(color) {
					context.removeClass(this.target, color, false);
				}, this);

				if(!_.isUndefined(value) && !_.isEmpty(value)) context.addClass(this.target, value, false);
			}
		});
JS;
	}

	/**
	 * Returns the javascript code to generate this actions equivalent.
	 *
	 * This is used for BWC modules only
	 *
	 * @return string javascript.
	 */
	public function getJavascriptFire()
	{
		return "new SUGAR.forms.SetColorAction('{$this->targetField}','" . addslashes($this->expression) . "', '{$this->colors}')";
	}

	/**
	 * Applies the Action to the target.
	 *
	 * @param SugarBean $target
	 */
	public function fire(&$target)
	{
		//This is a no-op under PHP
	}

	/**
	 * Returns the definition of this action in array format.
	 *
	 * @return array
	 */
	public function getDefinition()
	{
		return array(
			'action' => $this->getActionName(),
			'params' => array(
				'target' => $this->targetField,
				'value' => $this->expression,
				'colors' => $this->colors
			)
		);
	}

	/**
	 * The Action Name
	 *
	 * @return string
	 */
	public static function getActionName()
	{
		return 'SetColor';
	}
}

<?php
$dependencies['Products']['setcolor'] = [
	'hooks' => ["edit", "view"],
	'trigger' => 'equal($the_field_c, true)',
	'triggerFields' => ['the_field_c'],
	'onload' => true,
	'actions' => [
		[
			'name' => 'SetColor',
			'params' => [
				'target' => 'the_field_c',
				'value' => '"label red"',
				'colors' => 'createList("label red")',
				'errorValue' => '"label red"',
			],
		],
	],
];

?>