You can set near anything inside the tooltips (images, texts, numbers).

This is done using custom tokens.

In order to set custom tokens in tooltips you need to create a custom token with structure of data-__ where the __ will be what ever you choose.

For example:

If I want to set a custom tooltip for full names I would do this as such:

 data-fullName:[Joe Doe, John Lee, Jane Kane]  

And subsequently display these custom tokens in the tooltip in the text by using

 text: "%data-fullName"  

Here is a demo to show you how this is done: DEMO

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