For the title, as well as the front- and back-matter custom text, you can use the following text replacement values.
Please note that not all websites will provide all values
{title} - Article Title
{pageTitle} - Title of the actual page
{length} - Length of the article, in characters
{excerpt} - Article description or short excerpt from the content
{byline} - Author metadata
{dir} - Content direction
{baseURI} - The url of the article
{date:FORMAT} - The current date and time. Check the format reference