HTML to Jira description

Hello everyone.

Am developing Jira server plugin to connect jira with external system.
I have to convert jira description into HTML, and its quite easy:

private String convertJiraDescriptionToHtml(String jiraDescription) {
		EventPublisher eventPublisher = ComponentAccessor.getOSGiComponentInstanceOfType (EventPublisher.class);
		VelocityRequestContextFactory velocityRequestContextFactory = ComponentAccessor.getOSGiComponentInstanceOfType(VelocityRequestContextFactory.class);
		AtlassianWikiRenderer wikiRenderer = new AtlassianWikiRenderer(eventPublisher, ComponentAccessor.getApplicationProperties(), velocityRequestContextFactory);
		return wikiRenderer.render(jiraDescription, null);
	}

The question is: how to do it ive versa - format HTML into jira formatter to make HTML description jiraFormatted