You'd need to create a new tab or field type plugin depending on if you wanted to render that as a tab or a field. You can use the CB LastViews Tab plugin as a simplified starting point as it's pretty barebones and straight forward for making a tab plugin. As for a fieldtype plugin CB Gravatar Field is also a pretty simple example. Alternatively you could develop it as a Joomla module then just load the module in a Custom HTML field using Joomla's loadmodule shortcode.